128917465544 has 32 divisors (see below), whose sum is σ = 276275176320. Its totient is φ = 55245649536.

The previous prime is 128917465543. The next prime is 128917465597. The reversal of 128917465544 is 445564719821.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a self number, because there is not a number n which added to its sum of digits gives 128917465544.

It is not an unprimeable number, because it can be changed into a prime (128917465541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613172 + ... + 796124.

It is an arithmetic number, because the mean of its divisors is an integer number (8633599260).

Almost surely, 2^128917465544 is an apocalyptic number.

128917465544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128917465544 is an abundant number, since it is smaller than the sum of its proper divisors (147357710776).

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

128917465544 is a wasteful number, since it uses less digits than its factorization.

128917465544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195549 (or 195545 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 56.

The spelling of 128917465544 in words is "one hundred twenty-eight billion, nine hundred seventeen million, four hundred sixty-five thousand, five hundred forty-four".