137158728 has 64 divisors (see below), whose sum is σ = 392770560. Its totient is φ = 39099456.

The previous prime is 137158709. The next prime is 137158789. The reversal of 137158728 is 827851731.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 137158728.

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, 121575 + ... + 122697.

It is an arithmetic number, because the mean of its divisors is an integer number (6137040).

Almost surely, 2^137158728 is an apocalyptic number.

It is an amenable number.

137158728 is an abundant number, since it is smaller than the sum of its proper divisors (255611832).

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

137158728 is a wasteful number, since it uses less digits than its factorization.

137158728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866 (or 1862 counting only the distinct ones).

The product of its digits is 94080, while the sum is 42.

The square root of 137158728 is about 11711.4784719949. The cubic root of 137158728 is about 515.7126878380.

The spelling of 137158728 in words is "one hundred thirty-seven million, one hundred fifty-eight thousand, seven hundred twenty-eight".