77864957 has 2 divisors, whose sum is σ = 77864958. Its totient is φ = 77864956.

The previous prime is 77864911. The next prime is 77864987. The reversal of 77864957 is 75946877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72267001 + 5597956 = 8501^2 + 2366^2 .

It is a cyclic number.

It is not a de Polignac number, because 77864957 - 2⁶ = 77864893 is a prime.

It is a super-2 number, since 2×77864957² = 12125903057223698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77864899 and 77864908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77864987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38932478 + 38932479.

It is an arithmetic number, because the mean of its divisors is an integer number (38932479).

Almost surely, 2^77864957 is an apocalyptic number.

It is an amenable number.

77864957 is a deficient number, since it is larger than the sum of its proper divisors (1).

77864957 is an equidigital number, since it uses as much as digits as its factorization.

77864957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2963520, while the sum is 53.

The square root of 77864957 is about 8824.1122499660. The cubic root of 77864957 is about 427.0191476769.

The spelling of 77864957 in words is "seventy-seven million, eight hundred sixty-four thousand, nine hundred fifty-seven".