77940887 has 2 divisors, whose sum is σ = 77940888. Its totient is φ = 77940886.

The previous prime is 77940881. The next prime is 77940911. The reversal of 77940887 is 78804977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77940887 - 2⁶ = 77940823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77940881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38970443 + 38970444.

It is an arithmetic number, because the mean of its divisors is an integer number (38970444).

Almost surely, 2^77940887 is an apocalyptic number.

77940887 is a deficient number, since it is larger than the sum of its proper divisors (1).

77940887 is an equidigital number, since it uses as much as digits as its factorization.

77940887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 77940887 is about 8828.4136174060. The cubic root of 77940887 is about 427.1579051341.

The spelling of 77940887 in words is "seventy-seven million, nine hundred forty thousand, eight hundred eighty-seven".