189292438728 has 80 divisors (see below), whose sum is σ = 530446999500. Its totient is φ = 63067382784.

The previous prime is 189292438723. The next prime is 189292438757. The reversal of 189292438728 is 827834292981.

189292438728 is a `hidden beast` number, since 1 + 8 + 92 + 92 + 438 + 7 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 185366413764 + 3926024964 = 430542^2 + 62658^2 .

It is not an unprimeable number, because it can be changed into a prime (189292438723) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1310988 + ... + 1448196.

Almost surely, 2^189292438728 is an apocalyptic number.

189292438728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

189292438728 is an abundant number, since it is smaller than the sum of its proper divisors (341154560772).

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

189292438728 is a wasteful number, since it uses less digits than its factorization.

189292438728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139356 (or 139343 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The spelling of 189292438728 in words is "one hundred eighty-nine billion, two hundred ninety-two million, four hundred thirty-eight thousand, seven hundred twenty-eight".