128708490 has 32 divisors (see below), whose sum is σ = 313137216. Its totient is φ = 33851520.

The previous prime is 128708453. The next prime is 128708521. The reversal of 128708490 is 94807821.

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, 27196 + ... + 31575.

It is an arithmetic number, because the mean of its divisors is an integer number (9785538).

Almost surely, 2^128708490 is an apocalyptic number.

128708490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128708490 is an abundant number, since it is smaller than the sum of its proper divisors (184428726).

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

128708490 is a wasteful number, since it uses less digits than its factorization.

128708490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58854.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 128708490 is about 11344.9764213065. The cubic root of 128708490 is about 504.8965445035.

The spelling of 128708490 in words is "one hundred twenty-eight million, seven hundred eight thousand, four hundred ninety".