78644552 has 16 divisors (see below), whose sum is σ = 168524160. Its totient is φ = 33704784.

The previous prime is 78644539. The next prime is 78644557. The reversal of 78644552 is 25544687.

It is not an unprimeable number, because it can be changed into a prime (78644557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702128 + ... + 702239.

It is an arithmetic number, because the mean of its divisors is an integer number (10532760).

Almost surely, 2^78644552 is an apocalyptic number.

It is an amenable number.

78644552 is an abundant number, since it is smaller than the sum of its proper divisors (89879608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78644552 is a wasteful number, since it uses less digits than its factorization.

78644552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404380 (or 1404376 counting only the distinct ones).

The product of its digits is 268800, while the sum is 41.

The square root of 78644552 is about 8868.1763627028. The cubic root of 78644552 is about 428.4395432071.

The spelling of 78644552 in words is "seventy-eight million, six hundred forty-four thousand, five hundred fifty-two".