128649472 has 144 divisors (see below), whose sum is σ = 321414912. Its totient is φ = 50135040.

The previous prime is 128649463. The next prime is 128649487. The reversal of 128649472 is 274946821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1248973 + ... + 1249075.

It is an arithmetic number, because the mean of its divisors is an integer number (2232048).

Almost surely, 2^128649472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128649472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160707456).

128649472 is an abundant number, since it is smaller than the sum of its proper divisors (192765440).

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

128649472 is a wasteful number, since it uses less digits than its factorization.

128649472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 170 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 128649472 is about 11342.3750599246. The cubic root of 128649472 is about 504.8193609394.

The spelling of 128649472 in words is "one hundred twenty-eight million, six hundred forty-nine thousand, four hundred seventy-two".