128887020 has 72 divisors (see below), whose sum is σ = 404454960. Its totient is φ = 33183360.

The previous prime is 128886959. The next prime is 128887037. The reversal of 128887020 is 20788821.

It is a super-2 number, since 2×128887020² = 33223727848960800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 7126 + ... + 17565.

It is an arithmetic number, because the mean of its divisors is an integer number (5617430).

Almost surely, 2^128887020 is an apocalyptic number.

128887020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128887020 is an abundant number, since it is smaller than the sum of its proper divisors (275567940).

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

128887020 is a wasteful number, since it uses less digits than its factorization.

128887020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24735 (or 24730 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 128887020 is about 11352.8419349518. The cubic root of 128887020 is about 505.1298819603.

The spelling of 128887020 in words is "one hundred twenty-eight million, eight hundred eighty-seven thousand, twenty".