128998790 has 16 divisors (see below), whose sum is σ = 244419120. Its totient is φ = 48883680.

The previous prime is 128998783. The next prime is 128998799. The reversal of 128998790 is 97899821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128998799) 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, 339281 + ... + 339660.

It is an arithmetic number, because the mean of its divisors is an integer number (15276195).

Almost surely, 2^128998790 is an apocalyptic number.

128998790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128998790 is a deficient number, since it is larger than the sum of its proper divisors (115420330).

128998790 is a wasteful number, since it uses less digits than its factorization.

128998790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678967.

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 128998790 is about 11357.7634241958. The cubic root of 128998790 is about 505.2758549079.

The spelling of 128998790 in words is "one hundred twenty-eight million, nine hundred ninety-eight thousand, seven hundred ninety".