128125404 has 36 divisors (see below), whose sum is σ = 353316600. Its totient is φ = 38825760.

The previous prime is 128125391. The next prime is 128125409. The reversal of 128125404 is 404521821.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×128125404² = 32832238300326432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128125409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161379 + ... + 162170.

It is an arithmetic number, because the mean of its divisors is an integer number (9814350).

Almost surely, 2^128125404 is an apocalyptic number.

It is an amenable number.

128125404 is an abundant number, since it is smaller than the sum of its proper divisors (225191196).

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

128125404 is a wasteful number, since it uses less digits than its factorization.

128125404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323570 (or 323565 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 128125404 is about 11319.2492683923. The cubic root of 128125404 is about 504.1329486758.

The spelling of 128125404 in words is "one hundred twenty-eight million, one hundred twenty-five thousand, four hundred four".