78728744 has 16 divisors (see below), whose sum is σ = 150402420. Its totient is φ = 38621440.

The previous prime is 78728719. The next prime is 78728813. The reversal of 78728744 is 44782787.

It can be written as a sum of positive squares in 2 ways, for example, as 74476900 + 4251844 = 8630^2 + 2062^2 .

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 3 ways as a sum of consecutive naturals, for example, 92417 + ... + 93264.

Almost surely, 2^78728744 is an apocalyptic number.

It is an amenable number.

78728744 is a deficient number, since it is larger than the sum of its proper divisors (71673676).

78728744 is a wasteful number, since it uses less digits than its factorization.

78728744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185740 (or 185736 counting only the distinct ones).

The product of its digits is 702464, while the sum is 47.

The square root of 78728744 is about 8872.9219539000. The cubic root of 78728744 is about 428.5923756534.

The spelling of 78728744 in words is "seventy-eight million, seven hundred twenty-eight thousand, seven hundred forty-four".