78346816 has 14 divisors (see below), whose sum is σ = 155469590. Its totient is φ = 39173376.

The previous prime is 78346799. The next prime is 78346819. The reversal of 78346816 is 61864387.

It can be written as a sum of positive squares in only one way, i.e., 62346816 + 16000000 = 7896^2 + 4000^2 .

It is a super-2 number, since 2×78346816² = 12276447154675712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78346819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612021 + ... + 612148.

Almost surely, 2^78346816 is an apocalyptic number.

It is an amenable number.

78346816 is a deficient number, since it is larger than the sum of its proper divisors (77122774).

78346816 is a wasteful number, since it uses less digits than its factorization.

78346816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224181 (or 1224171 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 78346816 is about 8851.3736787010. The cubic root of 78346816 is about 427.8981910580.

The spelling of 78346816 in words is "seventy-eight million, three hundred forty-six thousand, eight hundred sixteen".