76928921 has 2 divisors, whose sum is σ = 76928922. Its totient is φ = 76928920.

The previous prime is 76928903. The next prime is 76928923. The reversal of 76928921 is 12982967.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70375321 + 6553600 = 8389^2 + 2560^2 .

It is a cyclic number.

It is not a de Polignac number, because 76928921 - 2²² = 72734617 is a prime.

Together with 76928923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76928923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38464460 + 38464461.

It is an arithmetic number, because the mean of its divisors is an integer number (38464461).

Almost surely, 2^76928921 is an apocalyptic number.

It is an amenable number.

76928921 is a deficient number, since it is larger than the sum of its proper divisors (1).

76928921 is an equidigital number, since it uses as much as digits as its factorization.

76928921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 76928921 is about 8770.9133503872. The cubic root of 76928921 is about 425.3011402054.

The spelling of 76928921 in words is "seventy-six million, nine hundred twenty-eight thousand, nine hundred twenty-one".