78522272 has 12 divisors (see below), whose sum is σ = 154590786. Its totient is φ = 39261120.

The previous prime is 78522259. The next prime is 78522281. The reversal of 78522272 is 27222587.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 73342096 + 5180176 = 8564^2 + 2276^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1226879 + ... + 1226942.

Almost surely, 2^78522272 is an apocalyptic number.

It is an amenable number.

78522272 is a deficient number, since it is larger than the sum of its proper divisors (76068514).

78522272 is a wasteful number, since it uses less digits than its factorization.

78522272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453831 (or 2453823 counting only the distinct ones).

The product of its digits is 31360, while the sum is 35.

The square root of 78522272 is about 8861.2793658704. The cubic root of 78522272 is about 428.2173758222.

The spelling of 78522272 in words is "seventy-eight million, five hundred twenty-two thousand, two hundred seventy-two".