76704921 has 16 divisors (see below), whose sum is σ = 115240320. Its totient is φ = 50415120.

The previous prime is 76704869. The next prime is 76704923. The reversal of 76704921 is 12940767.

It is a happy number.

It is not a de Polignac number, because 76704921 - 2⁶ = 76704857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (76704923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18090 + ... + 21923.

It is an arithmetic number, because the mean of its divisors is an integer number (7202520).

Almost surely, 2^76704921 is an apocalyptic number.

76704921 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

76704921 is a deficient number, since it is larger than the sum of its proper divisors (38535399).

76704921 is a wasteful number, since it uses less digits than its factorization.

76704921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40093 (or 40087 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 76704921 is about 8758.1345616518. The cubic root of 76704921 is about 424.8879446219.

The spelling of 76704921 in words is "seventy-six million, seven hundred four thousand, nine hundred twenty-one".