78992986 has 8 divisors (see below), whose sum is σ = 118590804. Its totient is φ = 39462720.

The previous prime is 78992983. The next prime is 78992993. The reversal of 78992986 is 68929987.

It can be written as a sum of positive squares in 2 ways, for example, as 77352025 + 1640961 = 8795^2 + 1281^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78992986.

It is not an unprimeable number, because it can be changed into a prime (78992983) 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, 13855 + ... + 18706.

Almost surely, 2^78992986 is an apocalyptic number.

78992986 is a deficient number, since it is larger than the sum of its proper divisors (39597818).

78992986 is a wasteful number, since it uses less digits than its factorization.

78992986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33776.

The product of its digits is 3919104, while the sum is 58.

The square root of 78992986 is about 8887.7998402304. The cubic root of 78992986 is about 429.0713436117.

The spelling of 78992986 in words is "seventy-eight million, nine hundred ninety-two thousand, nine hundred eighty-six".