78569984 has 20 divisors (see below), whose sum is σ = 156987534. Its totient is φ = 39284736.

The previous prime is 78569977. The next prime is 78569989. The reversal of 78569984 is 48996587.

It can be written as a sum of positive squares in only one way, i.e., 44089600 + 34480384 = 6640^2 + 5872^2 .

It is not an unprimeable number, because it can be changed into a prime (78569989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76217 + ... + 77240.

Almost surely, 2^78569984 is an apocalyptic number.

It is an amenable number.

78569984 is a deficient number, since it is larger than the sum of its proper divisors (78417550).

78569984 is an equidigital number, since it uses as much as digits as its factorization.

78569984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153475 (or 153459 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 56.

The square root of 78569984 is about 8863.9711190865. The cubic root of 78569984 is about 428.3040899487.

The spelling of 78569984 in words is "seventy-eight million, five hundred sixty-nine thousand, nine hundred eighty-four".