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75308231 = 247730403
BaseRepresentation
bin1000111110100…
…01110011000111
312020201001110202
410133101303013
5123234330411
611250041115
71603052345
oct437216307
9166631422
1075308231
1139567209
122127919b
13127a99ab
14a004995
15692883b
hex47d1cc7

75308231 has 4 divisors (see below), whose sum is σ = 75341112. Its totient is φ = 75275352.

The previous prime is 75308203. The next prime is 75308237. The reversal of 75308231 is 13280357.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13280357 = 85315569.

It is a cyclic number.

It is not a de Polignac number, because 75308231 - 222 = 71113927 is a prime.

It is a super-2 number, since 2×753082312 = 11342659312698722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75308194 and 75308203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75308237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12725 + ... + 17678.

It is an arithmetic number, because the mean of its divisors is an integer number (18835278).

Almost surely, 275308231 is an apocalyptic number.

75308231 is a deficient number, since it is larger than the sum of its proper divisors (32881).

75308231 is a wasteful number, since it uses less digits than its factorization.

75308231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32880.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 75308231 is about 8678.0315164212. The cubic root of 75308231 is about 422.2932587952.

Adding to 75308231 its reverse (13280357), we get a palindrome (88588588).

The spelling of 75308231 in words is "seventy-five million, three hundred eight thousand, two hundred thirty-one".

Divisors: 1 2477 30403 75308231