78572728 has 32 divisors (see below), whose sum is σ = 162534960. Its totient is φ = 35377920.

The previous prime is 78572723. The next prime is 78572731. The reversal of 78572728 is 82727587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78572723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4950 + ... + 13477.

Almost surely, 2^78572728 is an apocalyptic number.

It is an amenable number.

78572728 is an abundant number, since it is smaller than the sum of its proper divisors (83962232).

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

78572728 is a wasteful number, since it uses less digits than its factorization.

78572728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18487 (or 18483 counting only the distinct ones).

The product of its digits is 439040, while the sum is 46.

The square root of 78572728 is about 8864.1259016329. The cubic root of 78572728 is about 428.3090759611.

It can be divided in two parts, 7857 and 2728, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 78572728 in words is "seventy-eight million, five hundred seventy-two thousand, seven hundred twenty-eight".