2728808644 has 9 divisors (see below), whose sum is σ = 4775597967. Its totient is φ = 1364352084.

The previous prime is 2728808623. The next prime is 2728808659. The reversal of 2728808644 is 4468088272.

The square root of 2728808644 is 52238.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 91417 + ... + 117535.

Almost surely, 2^2728808644 is an apocalyptic number.

2728808644 is the 52238-th square number.

It is an amenable number.

2728808644 is a deficient number, since it is larger than the sum of its proper divisors (2046789323).

2728808644 is an frugal number, since it uses more digits than its factorization.

2728808644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52242 (or 26121 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 49.

The cubic root of 2728808644 is about 1397.4116536200.

Multiplying 2728808644 by its sum of digits (49), we get a square (133711623556 = 365666²).

The spelling of 2728808644 in words is "two billion, seven hundred twenty-eight million, eight hundred eight thousand, six hundred forty-four".