76904909 has 4 divisors (see below), whose sum is σ = 77329980. Its totient is φ = 76479840.

The previous prime is 76904899. The next prime is 76904917. The reversal of 76904909 is 90940967.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15721225 + 61183684 = 3965^2 + 7822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76904909 is a prime.

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 76904909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76904969) 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, 212264 + ... + 212625.

It is an arithmetic number, because the mean of its divisors is an integer number (19332495).

Almost surely, 2^76904909 is an apocalyptic number.

It is an amenable number.

76904909 is a deficient number, since it is larger than the sum of its proper divisors (425071).

76904909 is a wasteful number, since it uses less digits than its factorization.

76904909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425070.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 76904909 is about 8769.5444009367. The cubic root of 76904909 is about 425.2568855282.

The spelling of 76904909 in words is "seventy-six million, nine hundred four thousand, nine hundred nine".