128750640 has 40 divisors (see below), whose sum is σ = 399127728. Its totient is φ = 34333440.

The previous prime is 128750627. The next prime is 128750647. The reversal of 128750640 is 46057821.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (128750647) 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, 267991 + ... + 268470.

Almost surely, 2^128750640 is an apocalyptic number.

128750640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128750640 is an abundant number, since it is smaller than the sum of its proper divisors (270377088).

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

128750640 is a wasteful number, since it uses less digits than its factorization.

128750640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536477 (or 536471 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 128750640 is about 11346.8339196447. The cubic root of 128750640 is about 504.9516537059.

The spelling of 128750640 in words is "one hundred twenty-eight million, seven hundred fifty thousand, six hundred forty".