76640856 has 24 divisors (see below), whose sum is σ = 191709420. Its totient is φ = 25532656.

The previous prime is 76640821. The next prime is 76640873. The reversal of 76640856 is 65804667.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41995 + ... + 43781.

Almost surely, 2^76640856 is an apocalyptic number.

It is an amenable number.

76640856 is an abundant number, since it is smaller than the sum of its proper divisors (115068564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

76640856 is an equidigital number, since it uses as much as digits as its factorization.

76640856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3583 (or 1792 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 76640856 is about 8754.4763407071. The cubic root of 76640856 is about 424.7696209314.

The spelling of 76640856 in words is "seventy-six million, six hundred forty thousand, eight hundred fifty-six".