78646432 has 24 divisors (see below), whose sum is σ = 155343636. Its totient is φ = 39194112.

The previous prime is 78646397. The next prime is 78646433. The reversal of 78646432 is 23464687.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78074896 + 571536 = 8836^2 + 756^2 .

It is a super-2 number, since 2×78646432² = 12370522532661248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78646433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6268 + ... + 14020.

Almost surely, 2^78646432 is an apocalyptic number.

It is an amenable number.

78646432 is a deficient number, since it is larger than the sum of its proper divisors (76697204).

78646432 is a wasteful number, since it uses less digits than its factorization.

78646432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8080 (or 8072 counting only the distinct ones).

The product of its digits is 193536, while the sum is 40.

The square root of 78646432 is about 8868.2823590592. The cubic root of 78646432 is about 428.4429571326.

The spelling of 78646432 in words is "seventy-eight million, six hundred forty-six thousand, four hundred thirty-two".