75643381 has 8 divisors (see below), whose sum is σ = 82593504. Its totient is φ = 68705520.

The previous prime is 75643367. The next prime is 75643391. The reversal of 75643381 is 18334657.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75643381 is a prime.

It is a super-2 number, since 2×75643381² = 11443842178222322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75643381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75643361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13995 + ... + 18631.

It is an arithmetic number, because the mean of its divisors is an integer number (10324188).

Almost surely, 2^75643381 is an apocalyptic number.

It is an amenable number.

75643381 is a deficient number, since it is larger than the sum of its proper divisors (6950123).

75643381 is a wasteful number, since it uses less digits than its factorization.

75643381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131.

The product of its digits is 60480, while the sum is 37.

The square root of 75643381 is about 8697.3203344478. The cubic root of 75643381 is about 422.9187864659.

The spelling of 75643381 in words is "seventy-five million, six hundred forty-three thousand, three hundred eighty-one".