128591408 has 20 divisors (see below), whose sum is σ = 271795848. Its totient is φ = 58450560.

The previous prime is 128591369. The next prime is 128591453. The reversal of 128591408 is 804195821.

It is a super-2 number, since 2×128591408² = 33071500422844928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365141 + ... + 365492.

Almost surely, 2^128591408 is an apocalyptic number.

It is an amenable number.

128591408 is an abundant number, since it is smaller than the sum of its proper divisors (143204440).

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

128591408 is a wasteful number, since it uses less digits than its factorization.

128591408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730652 (or 730646 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 128591408 is about 11339.8151660422. The cubic root of 128591408 is about 504.7434019742.

The spelling of 128591408 in words is "one hundred twenty-eight million, five hundred ninety-one thousand, four hundred eight".