77790631 has 2 divisors, whose sum is σ = 77790632. Its totient is φ = 77790630.

The previous prime is 77790619. The next prime is 77790641. The reversal of 77790631 is 13609777.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77790631 - 2⁵ = 77790599 is a prime.

It is a super-2 number, since 2×77790631² = 12102764542756322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77790611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38895315 + 38895316.

It is an arithmetic number, because the mean of its divisors is an integer number (38895316).

Almost surely, 2^77790631 is an apocalyptic number.

77790631 is a deficient number, since it is larger than the sum of its proper divisors (1).

77790631 is an equidigital number, since it uses as much as digits as its factorization.

77790631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55566, while the sum is 40.

The square root of 77790631 is about 8819.8997159832. The cubic root of 77790631 is about 426.8832340368.

The spelling of 77790631 in words is "seventy-seven million, seven hundred ninety thousand, six hundred thirty-one".