78216216 has 32 divisors (see below), whose sum is σ = 210582960. Its totient is φ = 24066432.

The previous prime is 78216197. The next prime is 78216283. The reversal of 78216216 is 61261287.

It is a super-2 number, since 2×78216216² = 12235552890717312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125035 + ... + 125658.

Almost surely, 2^78216216 is an apocalyptic number.

It is an amenable number.

78216216 is an abundant number, since it is smaller than the sum of its proper divisors (132366744).

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

78216216 is a wasteful number, since it uses less digits than its factorization.

78216216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250715 (or 250711 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 78216216 is about 8843.9932157369. The cubic root of 78216216 is about 427.6602976034.

The spelling of 78216216 in words is "seventy-eight million, two hundred sixteen thousand, two hundred sixteen".