78680690 has 32 divisors (see below), whose sum is σ = 154958400. Its totient is φ = 28526400.

The previous prime is 78680671. The next prime is 78680737. The reversal of 78680690 is 9608687.

It is a super-2 number, since 2×78680690² = 12381301957752200, 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 15 ways as a sum of consecutive naturals, for example, 45461 + ... + 47159.

It is an arithmetic number, because the mean of its divisors is an integer number (4842450).

Almost surely, 2^78680690 is an apocalyptic number.

78680690 is a deficient number, since it is larger than the sum of its proper divisors (76277710).

78680690 is a wasteful number, since it uses less digits than its factorization.

78680690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 78680690 is about 8870.2136389154. The cubic root of 78680690 is about 428.5051573189.

The spelling of 78680690 in words is "seventy-eight million, six hundred eighty thousand, six hundred ninety".