78118660 has 12 divisors (see below), whose sum is σ = 164049228. Its totient is φ = 31247456.

The previous prime is 78118657. The next prime is 78118679. The reversal of 78118660 is 6681187.

It can be written as a sum of positive squares in 2 ways, for example, as 17372224 + 60746436 = 4168^2 + 7794^2 .

It is a super-2 number, since 2×78118660² = 12205050080391200, which contains 22 as substring.

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, 1952947 + ... + 1952986.

It is an arithmetic number, because the mean of its divisors is an integer number (13670769).

Almost surely, 2^78118660 is an apocalyptic number.

It is an amenable number.

78118660 is an abundant number, since it is smaller than the sum of its proper divisors (85930568).

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

78118660 is a wasteful number, since it uses less digits than its factorization.

78118660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905942 (or 3905940 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 78118660 is about 8838.4761129960. The cubic root of 78118660 is about 427.4824223590.

It can be divided in two parts, 7811 and 8660, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 78118660 in words is "seventy-eight million, one hundred eighteen thousand, six hundred sixty".