77640450 has 24 divisors (see below), whose sum is σ = 192548688. Its totient is φ = 20704080.

The previous prime is 77640443. The next prime is 77640509. The reversal of 77640450 is 5404677.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258652 + ... + 258951.

It is an arithmetic number, because the mean of its divisors is an integer number (8022862).

Almost surely, 2^77640450 is an apocalyptic number.

77640450 is an abundant number, since it is smaller than the sum of its proper divisors (114908238).

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

77640450 is a wasteful number, since it uses less digits than its factorization.

77640450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517618 (or 517613 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 77640450 is about 8811.3818439561. The cubic root of 77640450 is about 426.6083463852.

The spelling of 77640450 in words is "seventy-seven million, six hundred forty thousand, four hundred fifty".