77900257 has 2 divisors, whose sum is σ = 77900258. Its totient is φ = 77900256.

The previous prime is 77900243. The next prime is 77900267. The reversal of 77900257 is 75200977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45819361 + 32080896 = 6769^2 + 5664^2 .

It is a cyclic number.

It is not a de Polignac number, because 77900257 - 2⁷ = 77900129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77900227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38950128 + 38950129.

It is an arithmetic number, because the mean of its divisors is an integer number (38950129).

Almost surely, 2^77900257 is an apocalyptic number.

It is an amenable number.

77900257 is a deficient number, since it is larger than the sum of its proper divisors (1).

77900257 is an equidigital number, since it uses as much as digits as its factorization.

77900257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30870, while the sum is 37.

The square root of 77900257 is about 8826.1122245301. The cubic root of 77900257 is about 427.0836674950.

The spelling of 77900257 in words is "seventy-seven million, nine hundred thousand, two hundred fifty-seven".