78744986 has 12 divisors (see below), whose sum is σ = 125475198. Its totient is φ = 37056192.

The previous prime is 78744983. The next prime is 78745021. The reversal of 78744986 is 68944787.

It can be written as a sum of positive squares in 3 ways, for example, as 77774761 + 970225 = 8819^2 + 985^2 .

It is a super-3 number, since 3×78744986³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (78744983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67541 + ... + 68696.

Almost surely, 2^78744986 is an apocalyptic number.

78744986 is a deficient number, since it is larger than the sum of its proper divisors (46730212).

78744986 is a wasteful number, since it uses less digits than its factorization.

78744986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136273 (or 136256 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 53.

The square root of 78744986 is about 8873.8371632569. The cubic root of 78744986 is about 428.6218469679.

The spelling of 78744986 in words is "seventy-eight million, seven hundred forty-four thousand, nine hundred eighty-six".