128397516 has 48 divisors (see below), whose sum is σ = 339628800. Its totient is φ = 37426752.

The previous prime is 128397499. The next prime is 128397547. The reversal of 128397516 is 615793821.

It is a super-2 number, since 2×128397516² = 32971844229940512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18696 + ... + 24623.

It is an arithmetic number, because the mean of its divisors is an integer number (7075600).

Almost surely, 2^128397516 is an apocalyptic number.

It is an amenable number.

128397516 is an abundant number, since it is smaller than the sum of its proper divisors (211231284).

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

128397516 is a wasteful number, since it uses less digits than its factorization.

128397516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43358 (or 43356 counting only the distinct ones).

The product of its digits is 90720, while the sum is 42.

The square root of 128397516 is about 11331.2627716420. The cubic root of 128397516 is about 504.4895878762.

The spelling of 128397516 in words is "one hundred twenty-eight million, three hundred ninety-seven thousand, five hundred sixteen".