128908901574 has 24 divisors (see below), whose sum is σ = 286470088920. Its totient is φ = 42968754396.

The previous prime is 128908901543. The next prime is 128908901593. The reversal of 128908901574 is 475109809821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 128908901574.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2613957 + ... + 2662815.

It is an arithmetic number, because the mean of its divisors is an integer number (11936253705).

Almost surely, 2^128908901574 is an apocalyptic number.

128908901574 is an abundant number, since it is smaller than the sum of its proper divisors (157561187346).

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

128908901574 is an frugal number, since it uses more digits than its factorization.

128908901574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97729 (or 48864 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

Multiplying 128908901574 by its sum of digits (54), we get a square (6961080684996 = 2638386²).

128908901574 divided by its sum of digits (54) gives a square (2387201881 = 48859²).

The spelling of 128908901574 in words is "one hundred twenty-eight billion, nine hundred eight million, nine hundred one thousand, five hundred seventy-four".