78813690 has 16 divisors (see below), whose sum is σ = 189152928. Its totient is φ = 21016976.

The previous prime is 78813671. The next prime is 78813731. The reversal of 78813690 is 9631887.

It is a super-2 number, since 2×78813690² = 12423195462832200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1313532 + ... + 1313591.

It is an arithmetic number, because the mean of its divisors is an integer number (11822058).

Almost surely, 2^78813690 is an apocalyptic number.

78813690 is an abundant number, since it is smaller than the sum of its proper divisors (110339238).

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

78813690 is a wasteful number, since it uses less digits than its factorization.

78813690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627133.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 78813690 is about 8877.7074743427. The cubic root of 78813690 is about 428.7464664375.

The spelling of 78813690 in words is "seventy-eight million, eight hundred thirteen thousand, six hundred ninety".