76639431 has 32 divisors (see below), whose sum is σ = 117573120. Its totient is φ = 43971200.

The previous prime is 76639411. The next prime is 76639439. The reversal of 76639431 is 13493667.

It is a cyclic number.

It is not a de Polignac number, because 76639431 - 2⁵ = 76639399 is a prime.

It is a super-2 number, since 2×76639431² = 11747204768007522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 76639431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76639439) 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 31 ways as a sum of consecutive naturals, for example, 49966 + ... + 51476.

It is an arithmetic number, because the mean of its divisors is an integer number (3674160).

Almost surely, 2^76639431 is an apocalyptic number.

76639431 is a deficient number, since it is larger than the sum of its proper divisors (40933689).

76639431 is a wasteful number, since it uses less digits than its factorization.

76639431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607.

The product of its digits is 81648, while the sum is 39.

The square root of 76639431 is about 8754.3949533934. The cubic root of 76639431 is about 424.7669883040.

The spelling of 76639431 in words is "seventy-six million, six hundred thirty-nine thousand, four hundred thirty-one".