75420381 has 32 divisors (see below), whose sum is σ = 112285440. Its totient is φ = 44785664.

The previous prime is 75420379. The next prime is 75420391. The reversal of 75420381 is 18302457.

It is a cyclic number.

It is not a de Polignac number, because 75420381 - 2¹ = 75420379 is a prime.

It is a super-2 number, since 2×75420381² = 11376467740370322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75420311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132265 + ... + 132833.

It is an arithmetic number, because the mean of its divisors is an integer number (3508920).

Almost surely, 2^75420381 is an apocalyptic number.

It is an amenable number.

75420381 is a deficient number, since it is larger than the sum of its proper divisors (36865059).

75420381 is a wasteful number, since it uses less digits than its factorization.

75420381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 75420381 is about 8684.4908313614. The cubic root of 75420381 is about 422.5027830308.

The spelling of 75420381 in words is "seventy-five million, four hundred twenty thousand, three hundred eighty-one".