78428524 has 12 divisors (see below), whose sum is σ = 140170464. Its totient is φ = 38379824.

The previous prime is 78428513. The next prime is 78428549. The reversal of 78428524 is 42582487.

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, 208399 + ... + 208774.

It is an arithmetic number, because the mean of its divisors is an integer number (11680872).

Almost surely, 2^78428524 is an apocalyptic number.

It is an amenable number.

78428524 is a deficient number, since it is larger than the sum of its proper divisors (61741940).

78428524 is a wasteful number, since it uses less digits than its factorization.

78428524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417224 (or 417222 counting only the distinct ones).

The product of its digits is 143360, while the sum is 40.

The square root of 78428524 is about 8855.9880307056. The cubic root of 78428524 is about 428.0468912435.

The spelling of 78428524 in words is "seventy-eight million, four hundred twenty-eight thousand, five hundred twenty-four".