136990720 has 52 divisors (see below), whose sum is σ = 328786740. Its totient is φ = 54788096.

The previous prime is 136990681. The next prime is 136990723. The reversal of 136990720 is 27099631.

It can be written as a sum of positive squares in 2 ways, for example, as 83759104 + 53231616 = 9152^2 + 7296^2 .

It is a super-2 number, since 2×136990720² = 37532914732236800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 136990720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136990723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17136 + ... + 23824.

Almost surely, 2^136990720 is an apocalyptic number.

136990720 is a gapful number since it is divisible by the number (10) 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 136990720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164393370).

136990720 is an abundant number, since it is smaller than the sum of its proper divisors (191796020).

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

136990720 is an frugal number, since it uses more digits than its factorization.

136990720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6718 (or 6696 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 136990720 is about 11704.3034820531. The cubic root of 136990720 is about 515.5020334626.

The spelling of 136990720 in words is "one hundred thirty-six million, nine hundred ninety thousand, seven hundred twenty".