78521324 has 18 divisors (see below), whose sum is σ = 159847380. Its totient is φ = 33651912.

The previous prime is 78521323. The next prime is 78521341. The reversal of 78521324 is 42312587.

It is not an unprimeable number, because it can be changed into a prime (78521323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 200114 + ... + 200505.

It is an arithmetic number, because the mean of its divisors is an integer number (8880410).

Almost surely, 2^78521324 is an apocalyptic number.

It is an amenable number.

78521324 is an abundant number, since it is smaller than the sum of its proper divisors (81326056).

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

78521324 is a wasteful number, since it uses less digits than its factorization.

78521324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400637 (or 400628 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 78521324 is about 8861.2258745616. The cubic root of 78521324 is about 428.2156525247.

The spelling of 78521324 in words is "seventy-eight million, five hundred twenty-one thousand, three hundred twenty-four".