128315492 has 6 divisors (see below), whose sum is σ = 224552118. Its totient is φ = 64157744.

The previous prime is 128315477. The next prime is 128315497. The reversal of 128315492 is 294513821.

It can be written as a sum of positive squares in only one way, i.e., 104734756 + 23580736 = 10234^2 + 4856^2 .

It is not an unprimeable number, because it can be changed into a prime (128315497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16039433 + ... + 16039440.

It is an arithmetic number, because the mean of its divisors is an integer number (37425353).

Almost surely, 2^128315492 is an apocalyptic number.

It is an amenable number.

128315492 is a deficient number, since it is larger than the sum of its proper divisors (96236626).

128315492 is a wasteful number, since it uses less digits than its factorization.

128315492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32078877 (or 32078875 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 128315492 is about 11327.6428262900. The cubic root of 128315492 is about 504.3821375402.

The spelling of 128315492 in words is "one hundred twenty-eight million, three hundred fifteen thousand, four hundred ninety-two".