128408475 has 24 divisors (see below), whose sum is σ = 228634672. Its totient is φ = 63216000.

The previous prime is 128408461. The next prime is 128408507. The reversal of 128408475 is 574804821.

It is a happy number.

It is not a de Polignac number, because 128408475 - 2⁵ = 128408443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

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, 64876 + ... + 66825.

Almost surely, 2^128408475 is an apocalyptic number.

128408475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128408475 is a deficient number, since it is larger than the sum of its proper divisors (100226197).

128408475 is a wasteful number, since it uses less digits than its factorization.

128408475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131727 (or 131722 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 39.

The square root of 128408475 is about 11331.7463349653. The cubic root of 128408475 is about 504.5039405529.

The spelling of 128408475 in words is "one hundred twenty-eight million, four hundred eight thousand, four hundred seventy-five".