78016556 has 12 divisors (see below), whose sum is σ = 137737992. Its totient is φ = 38662848.

The previous prime is 78016537. The next prime is 78016567. The reversal of 78016556 is 65561087.

It is a happy number.

It is a super-2 number, since 2×78016556² = 12173166020202272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85850 + ... + 86753.

It is an arithmetic number, because the mean of its divisors is an integer number (11478166).

Almost surely, 2^78016556 is an apocalyptic number.

It is an amenable number.

78016556 is a deficient number, since it is larger than the sum of its proper divisors (59721436).

78016556 is a wasteful number, since it uses less digits than its factorization.

78016556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172720 (or 172718 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 78016556 is about 8832.6981155251. The cubic root of 78016556 is about 427.2960960043.

The spelling of 78016556 in words is "seventy-eight million, sixteen thousand, five hundred fifty-six".