77931030 has 16 divisors (see below), whose sum is σ = 187034544. Its totient is φ = 20781600.

The previous prime is 77931017. The next prime is 77931031. The reversal of 77931030 is 3013977.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2597701 = 77931030 / (7 + 7 + 9 + 3 + 1 + 0 + 3 + 0).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77931031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1298821 + ... + 1298880.

It is an arithmetic number, because the mean of its divisors is an integer number (11689659).

Almost surely, 2^77931030 is an apocalyptic number.

77931030 is an abundant number, since it is smaller than the sum of its proper divisors (109103514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77931030 is a wasteful number, since it uses less digits than its factorization.

77931030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2597711.

The product of its (nonzero) digits is 3969, while the sum is 30.

The square root of 77931030 is about 8827.8553454392. The cubic root of 77931030 is about 427.1398971576.

The spelling of 77931030 in words is "seventy-seven million, nine hundred thirty-one thousand, thirty".