77900000 has 144 divisors (see below), whose sum is σ = 206705520. Its totient is φ = 28800000.

The previous prime is 77899999. The next prime is 77900051. The reversal of 77900000 is 977.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1899980 + ... + 1900020.

It is an arithmetic number, because the mean of its divisors is an integer number (1435455).

Almost surely, 2^77900000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103352760).

77900000 is an abundant number, since it is smaller than the sum of its proper divisors (128805520).

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

77900000 is an equidigital number, since it uses as much as digits as its factorization.

77900000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 441, while the sum is 23.

The square root of 77900000 is about 8826.0976654465. The cubic root of 77900000 is about 427.0831978319.

Adding to 77900000 its reverse (977), we get a palindrome (77900977).

The spelling of 77900000 in words is "seventy-seven million, nine hundred thousand".