128721348 has 72 divisors (see below), whose sum is σ = 393748992. Its totient is φ = 34612992.

The previous prime is 128721347. The next prime is 128721353. The reversal of 128721348 is 843127821.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (128721347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10740 + ... + 19307.

It is an arithmetic number, because the mean of its divisors is an integer number (5468736).

Almost surely, 2^128721348 is an apocalyptic number.

128721348 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128721348 is an abundant number, since it is smaller than the sum of its proper divisors (265027644).

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

128721348 is a wasteful number, since it uses less digits than its factorization.

128721348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30081 (or 30076 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 128721348 is about 11345.5430896894. The cubic root of 128721348 is about 504.9133570271.

The spelling of 128721348 in words is "one hundred twenty-eight million, seven hundred twenty-one thousand, three hundred forty-eight".