78579728 has 10 divisors (see below), whose sum is σ = 152248254. Its totient is φ = 39289856.

The previous prime is 78579719. The next prime is 78579803. The reversal of 78579728 is 82797587.

It can be written as a sum of positive squares in only one way, i.e., 53699584 + 24880144 = 7328^2 + 4988^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78579728.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2455601 + ... + 2455632.

Almost surely, 2^78579728 is an apocalyptic number.

It is an amenable number.

78579728 is a deficient number, since it is larger than the sum of its proper divisors (73668526).

78579728 is a wasteful number, since it uses less digits than its factorization.

78579728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4911241 (or 4911235 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 53.

The square root of 78579728 is about 8864.5207428264. The cubic root of 78579728 is about 428.3217948547.

The spelling of 78579728 in words is "seventy-eight million, five hundred seventy-nine thousand, seven hundred twenty-eight".