136904724 has 108 divisors (see below), whose sum is σ = 388215828. Its totient is φ = 40634880.

The previous prime is 136904707. The next prime is 136904731. The reversal of 136904724 is 427409631.

It can be written as a sum of positive squares in 2 ways, for example, as 91584900 + 45319824 = 9570^2 + 6732^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 230572 + ... + 231164.

It is an arithmetic number, because the mean of its divisors is an integer number (3594591).

Almost surely, 2^136904724 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 136904724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194107914).

136904724 is an abundant number, since it is smaller than the sum of its proper divisors (251311104).

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

136904724 is a wasteful number, since it uses less digits than its factorization.

136904724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 136904724 is about 11700.6292138500. The cubic root of 136904724 is about 515.3941419879.

The spelling of 136904724 in words is "one hundred thirty-six million, nine hundred four thousand, seven hundred twenty-four".