722735136 has 120 divisors (see below), whose sum is σ = 2166060204. Its totient is φ = 236321280.

The previous prime is 722735119. The next prime is 722735177. The reversal of 722735136 is 631537227.

722735136 is a `hidden beast` number, since 72 + 2 + 73 + 513 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 681210000 + 41525136 = 26100^2 + 6444^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 722735136.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 134746 + ... + 140006.

Almost surely, 2^722735136 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 722735136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1083030102).

722735136 is an abundant number, since it is smaller than the sum of its proper divisors (1443325068).

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

722735136 is a wasteful number, since it uses less digits than its factorization.

722735136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5336 (or 5319 counting only the distinct ones).

The product of its digits is 52920, while the sum is 36.

The square root of 722735136 is about 26883.7336692655. The cubic root of 722735136 is about 897.4144459019.

The spelling of 722735136 in words is "seven hundred twenty-two million, seven hundred thirty-five thousand, one hundred thirty-six".