28772728644 has 48 divisors (see below), whose sum is σ = 73276277760. Its totient is φ = 8714651040.

The previous prime is 28772728631. The next prime is 28772728651. The reversal of 28772728644 is 44682727782.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215697 + ... + 322599.

It is an arithmetic number, because the mean of its divisors is an integer number (1526589120).

Almost surely, 2^28772728644 is an apocalyptic number.

It is an amenable number.

28772728644 is an abundant number, since it is smaller than the sum of its proper divisors (44503549116).

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

28772728644 is a wasteful number, since it uses less digits than its factorization.

28772728644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108960 (or 108958 counting only the distinct ones).

The product of its digits is 16859136, while the sum is 57.

The spelling of 28772728644 in words is "twenty-eight billion, seven hundred seventy-two million, seven hundred twenty-eight thousand, six hundred forty-four".