137539728 has 80 divisors (see below), whose sum is σ = 397196800. Its totient is φ = 45567360.

The previous prime is 137539723. The next prime is 137539729. The reversal of 137539728 is 827935731.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (137539723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77313 + ... + 79071.

It is an arithmetic number, because the mean of its divisors is an integer number (4964960).

Almost surely, 2^137539728 is an apocalyptic number.

137539728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 137539728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198598400).

137539728 is an abundant number, since it is smaller than the sum of its proper divisors (259657072).

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

137539728 is a wasteful number, since it uses less digits than its factorization.

137539728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957 (or 1945 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 137539728 is about 11727.7332848253. The cubic root of 137539728 is about 516.1897625468.

The spelling of 137539728 in words is "one hundred thirty-seven million, five hundred thirty-nine thousand, seven hundred twenty-eight".