78660994 has 4 divisors (see below), whose sum is σ = 117991494. Its totient is φ = 39330496.

The previous prime is 78660979. The next prime is 78661031. The reversal of 78660994 is 49906687.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 74909025 + 3751969 = 8655^2 + 1937^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19665247 + ... + 19665250.

Almost surely, 2^78660994 is an apocalyptic number.

78660994 is a deficient number, since it is larger than the sum of its proper divisors (39330500).

78660994 is a wasteful number, since it uses less digits than its factorization.

78660994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39330499.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 78660994 is about 8869.1033368656. The cubic root of 78660994 is about 428.4693986852.

The spelling of 78660994 in words is "seventy-eight million, six hundred sixty thousand, nine hundred ninety-four".