78646428 has 36 divisors (see below), whose sum is σ = 227201520. Its totient is φ = 22470336.

The previous prime is 78646397. The next prime is 78646433. The reversal of 78646428 is 82464687.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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, 155793 + ... + 156296.

Almost surely, 2^78646428 is an apocalyptic number.

It is an amenable number.

78646428 is an abundant number, since it is smaller than the sum of its proper divisors (148555092).

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

78646428 is a wasteful number, since it uses less digits than its factorization.

78646428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312106 (or 312101 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 78646428 is about 8868.2821335363. The cubic root of 78646428 is about 428.4429498690.

The spelling of 78646428 in words is "seventy-eight million, six hundred forty-six thousand, four hundred twenty-eight".