78679690 has 16 divisors (see below), whose sum is σ = 142000128. Its totient is φ = 31388176.

The previous prime is 78679687. The next prime is 78679721. The reversal of 78679690 is 9697687.

It is a super-2 number, since 2×78679690² = 12380987236992200, 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 7 ways as a sum of consecutive naturals, for example, 6442 + ... + 14101.

It is an arithmetic number, because the mean of its divisors is an integer number (8875008).

Almost surely, 2^78679690 is an apocalyptic number.

78679690 is a deficient number, since it is larger than the sum of its proper divisors (63320438).

78679690 is a wasteful number, since it uses less digits than its factorization.

78679690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20933.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The square root of 78679690 is about 8870.1572703081. The cubic root of 78679690 is about 428.5033419351.

The spelling of 78679690 in words is "seventy-eight million, six hundred seventy-nine thousand, six hundred ninety".