78216548 has 6 divisors (see below), whose sum is σ = 136878966. Its totient is φ = 39108272.

The previous prime is 78216533. The next prime is 78216571. The reversal of 78216548 is 84561287.

It can be written as a sum of positive squares in only one way, i.e., 43665664 + 34550884 = 6608^2 + 5878^2 .

It is a super-2 number, since 2×78216548² = 12235656762072608, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9777065 + ... + 9777072.

It is an arithmetic number, because the mean of its divisors is an integer number (22813161).

Almost surely, 2^78216548 is an apocalyptic number.

It is an amenable number.

78216548 is a deficient number, since it is larger than the sum of its proper divisors (58662418).

78216548 is a wasteful number, since it uses less digits than its factorization.

78216548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19554141 (or 19554139 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 78216548 is about 8844.0119855188. The cubic root of 78216548 is about 427.6609026911.

The spelling of 78216548 in words is "seventy-eight million, two hundred sixteen thousand, five hundred forty-eight".