78396216 has 32 divisors (see below), whose sum is σ = 196248960. Its totient is φ = 26097632.

The previous prime is 78396151. The next prime is 78396221. The reversal of 78396216 is 61269387.

It is a happy number.

It is a super-2 number, since 2×78396216² = 12291933366237312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21931 + ... + 25253.

It is an arithmetic number, because the mean of its divisors is an integer number (6132780).

Almost surely, 2^78396216 is an apocalyptic number.

It is an amenable number.

78396216 is an abundant number, since it is smaller than the sum of its proper divisors (117852744).

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

78396216 is a wasteful number, since it uses less digits than its factorization.

78396216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315 (or 4311 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 78396216 is about 8854.1637662740. The cubic root of 78396216 is about 427.9881063455.

The spelling of 78396216 in words is "seventy-eight million, three hundred ninety-six thousand, two hundred sixteen".