78190660 has 12 divisors (see below), whose sum is σ = 164200428. Its totient is φ = 31276256.

The previous prime is 78190631. The next prime is 78190661. The reversal of 78190660 is 6609187.

It can be written as a sum of positive squares in 2 ways, for example, as 15178816 + 63011844 = 3896^2 + 7938^2 .

It is a super-2 number, since 2×78190660² = 12227558622471200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78190661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1954747 + ... + 1954786.

It is an arithmetic number, because the mean of its divisors is an integer number (13683369).

Almost surely, 2^78190660 is an apocalyptic number.

It is an amenable number.

78190660 is an abundant number, since it is smaller than the sum of its proper divisors (86009768).

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

78190660 is a wasteful number, since it uses less digits than its factorization.

78190660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909542 (or 3909540 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 78190660 is about 8842.5482752428. The cubic root of 78190660 is about 427.6137152889.

The spelling of 78190660 in words is "seventy-eight million, one hundred ninety thousand, six hundred sixty".