128137892 has 24 divisors (see below), whose sum is σ = 234291960. Its totient is φ = 61241600.

The previous prime is 128137859. The next prime is 128137897. The reversal of 128137892 is 298731821.

It can be written as a sum of positive squares in 4 ways, for example, as 89000356 + 39137536 = 9434^2 + 6256^2 .

It is not an unprimeable number, because it can be changed into a prime (128137897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6248 + ... + 17184.

It is an arithmetic number, because the mean of its divisors is an integer number (9762165).

Almost surely, 2^128137892 is an apocalyptic number.

It is an amenable number.

128137892 is a deficient number, since it is larger than the sum of its proper divisors (106154068).

128137892 is a wasteful number, since it uses less digits than its factorization.

128137892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11071 (or 11069 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 128137892 is about 11319.8008816410. The cubic root of 128137892 is about 504.1493269207.

The spelling of 128137892 in words is "one hundred twenty-eight million, one hundred thirty-seven thousand, eight hundred ninety-two".