128521260 has 72 divisors (see below), whose sum is σ = 445544736. Its totient is φ = 29376000.

The previous prime is 128521259. The next prime is 128521273. The reversal of 128521260 is 62125821.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49741 + ... + 52260.

Almost surely, 2^128521260 is an apocalyptic number.

128521260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128521260 is an abundant number, since it is smaller than the sum of its proper divisors (317023476).

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

128521260 is a wasteful number, since it uses less digits than its factorization.

128521260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102023 (or 102018 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 128521260 is about 11336.7217483715. The cubic root of 128521260 is about 504.6516042901.

The spelling of 128521260 in words is "one hundred twenty-eight million, five hundred twenty-one thousand, two hundred sixty".