28472512644 has 27 divisors (see below), whose sum is σ = 71974744023. Its totient is φ = 9490500072.

The previous prime is 28472512639. The next prime is 28472512693. The reversal of 28472512644 is 44621527482.

The square root of 28472512644 is 168738.

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

28472512644 is a `hidden beast` number, since 2 + 8 + 4 + 72 + 512 + 64 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 28472512644.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 998367 + ... + 1026489.

Almost surely, 2^28472512644 is an apocalyptic number.

28472512644 is the 168738-th square number.

It is an amenable number.

28472512644 is an abundant number, since it is smaller than the sum of its proper divisors (43502231379).

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

28472512644 is an frugal number, since it uses more digits than its factorization.

28472512644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56256 (or 28128 counting only the distinct ones).

The product of its digits is 860160, while the sum is 45.

The spelling of 28472512644 in words is "twenty-eight billion, four hundred seventy-two million, five hundred twelve thousand, six hundred forty-four".