128408736 has 24 divisors (see below), whose sum is σ = 337073184. Its totient is φ = 42802880.

The previous prime is 128408729. The next prime is 128408767. The reversal of 128408736 is 637804821.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×128408736² = 32977606962235392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128408694 and 128408703.

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, 668700 + ... + 668891.

It is an arithmetic number, because the mean of its divisors is an integer number (14044716).

Almost surely, 2^128408736 is an apocalyptic number.

128408736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128408736 is an abundant number, since it is smaller than the sum of its proper divisors (208664448).

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

128408736 is a wasteful number, since it uses less digits than its factorization.

128408736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337604 (or 1337596 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 128408736 is about 11331.7578512780. The cubic root of 128408736 is about 504.5042823669.

The spelling of 128408736 in words is "one hundred twenty-eight million, four hundred eight thousand, seven hundred thirty-six".