78889924 has 9 divisors (see below), whose sum is σ = 138088461. Its totient is φ = 39436080.

The previous prime is 78889913. The next prime is 78889963. The reversal of 78889924 is 42998887.

The square root of 78889924 is 8882.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 30448324 + 48441600 = 5518^2 + 6960^2 .

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 15544 + ... + 19984.

Almost surely, 2^78889924 is an apocalyptic number.

78889924 is the 8882-nd square number.

It is an amenable number.

78889924 is a deficient number, since it is larger than the sum of its proper divisors (59198537).

78889924 is an frugal number, since it uses more digits than its factorization.

78889924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8886 (or 4443 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 55.

The cubic root of 78889924 is about 428.8846595415.

The spelling of 78889924 in words is "seventy-eight million, eight hundred eighty-nine thousand, nine hundred twenty-four".