128772544 has 28 divisors (see below), whose sum is σ = 258179824. Its totient is φ = 63719424.

The previous prime is 128772529. The next prime is 128772547. The reversal of 128772544 is 445277821.

It is a junction number, because it is equal to n+sod(n) for n = 128772497 and 128772506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128772547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4164 + ... + 16579.

It is an arithmetic number, because the mean of its divisors is an integer number (9220708).

Almost surely, 2^128772544 is an apocalyptic number.

It is an amenable number.

128772544 is an abundant number, since it is smaller than the sum of its proper divisors (129407280).

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

128772544 is an equidigital number, since it uses as much as digits as its factorization.

128772544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20852 (or 20842 counting only the distinct ones).

The product of its digits is 125440, while the sum is 40.

The square root of 128772544 is about 11347.7990817603. The cubic root of 128772544 is about 504.9802874376.

The spelling of 128772544 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, five hundred forty-four".