77898664440 has 64 divisors (see below), whose sum is σ = 259662218400. Its totient is φ = 20772976896.

The previous prime is 77898664423. The next prime is 77898664463. The reversal of 77898664440 is 4446689877.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36063117 + ... + 36065276.

Almost surely, 2^77898664440 is an apocalyptic number.

It is an amenable number.

77898664440 is an abundant number, since it is smaller than the sum of its proper divisors (181763553960).

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

77898664440 is a wasteful number, since it uses less digits than its factorization.

77898664440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72128413 (or 72128403 counting only the distinct ones).

The product of its (nonzero) digits is 65028096, while the sum is 63.

The spelling of 77898664440 in words is "seventy-seven billion, eight hundred ninety-eight million, six hundred sixty-four thousand, four hundred forty".