78772440 has 64 divisors (see below), whose sum is σ = 237051360. Its totient is φ = 20940800.

The previous prime is 78772433. The next prime is 78772451. The reversal of 78772440 is 4427787.

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, 47302 + ... + 48938.

Almost surely, 2^78772440 is an apocalyptic number.

It is an amenable number.

78772440 is an abundant number, since it is smaller than the sum of its proper divisors (158278920).

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

78772440 is a wasteful number, since it uses less digits than its factorization.

78772440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052 (or 2048 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 39.

The square root of 78772440 is about 8875.3839353574. The cubic root of 78772440 is about 428.6716533852.

The spelling of 78772440 in words is "seventy-eight million, seven hundred seventy-two thousand, four hundred forty".