28640146756 has 81 divisors (see below), whose sum is σ = 56935670589. Its totient is φ = 12599132832.

The previous prime is 28640146729. The next prime is 28640146757. The reversal of 28640146756 is 65764104682.

The square root of 28640146756 is 169234.

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

It can be written as a sum of positive squares in only one way, i.e., 4236708100 + 24403438656 = 65090^2 + 156216^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28640146757) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 101201791 + ... + 101202073.

Almost surely, 2^28640146756 is an apocalyptic number.

28640146756 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28640146756 is the 169234-th square number.

It is an amenable number.

28640146756 is a deficient number, since it is larger than the sum of its proper divisors (28295523833).

28640146756 is a wasteful number, since it uses less digits than its factorization.

28640146756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 49.

Multiplying 28640146756 by its sum of digits (49), we get a square (1403367191044 = 1184638²).

The spelling of 28640146756 in words is "twenty-eight billion, six hundred forty million, one hundred forty-six thousand, seven hundred fifty-six".