78797440 has 32 divisors (see below), whose sum is σ = 188376660. Its totient is φ = 31518720.

The previous prime is 78797413. The next prime is 78797479. The reversal of 78797440 is 4479787.

It can be written as a sum of positive squares in 2 ways, for example, as 77299264 + 1498176 = 8792^2 + 1224^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-4 number, since 4×78797440⁴ (a number of 33 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60921 + ... + 62200.

Almost surely, 2^78797440 is an apocalyptic number.

It is an amenable number.

78797440 is an abundant number, since it is smaller than the sum of its proper divisors (109579220).

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

78797440 is a wasteful number, since it uses less digits than its factorization.

78797440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123140 (or 123128 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 78797440 is about 8876.7922134068. The cubic root of 78797440 is about 428.7169977459.

The spelling of 78797440 in words is "seventy-eight million, seven hundred ninety-seven thousand, four hundred forty".