78369216 has 28 divisors (see below), whose sum is σ = 207352392. Its totient is φ = 26123008.

The previous prime is 78369149. The next prime is 78369227. The reversal of 78369216 is 61296387.

It is a happy number.

It is a super-2 number, since 2×78369216² = 12283468032909312, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203895 + ... + 204278.

Almost surely, 2^78369216 is an apocalyptic number.

It is an amenable number.

78369216 is an abundant number, since it is smaller than the sum of its proper divisors (128983176).

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

78369216 is a wasteful number, since it uses less digits than its factorization.

78369216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408188 (or 408178 counting only the distinct ones).

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

The square root of 78369216 is about 8852.6389285907. The cubic root of 78369216 is about 427.9389670446.

The spelling of 78369216 in words is "seventy-eight million, three hundred sixty-nine thousand, two hundred sixteen".