722949136 has 120 divisors (see below), whose sum is σ = 1776683160. Its totient is φ = 282433536.

The previous prime is 722949121. The next prime is 722949163. The reversal of 722949136 is 631949227.

It can be written as a sum of positive squares in 4 ways, for example, as 414736 + 722534400 = 644^2 + 26880^2 .

It is a junction number, because it is equal to n+sod(n) for n = 722949092 and 722949101.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 906690 + ... + 907486.

It is an arithmetic number, because the mean of its divisors is an integer number (14805693).

Almost surely, 2^722949136 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 722949136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (888341580).

722949136 is an abundant number, since it is smaller than the sum of its proper divisors (1053734024).

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

722949136 is a wasteful number, since it uses less digits than its factorization.

722949136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921 (or 908 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The square root of 722949136 is about 26887.7134766049. The cubic root of 722949136 is about 897.5030111914.

Subtracting from 722949136 its reverse (631949227), we obtain a palindrome (90999909).

It can be divided in two parts, 7229 and 49136, that added together give a palindrome (56365).

The spelling of 722949136 in words is "seven hundred twenty-two million, nine hundred forty-nine thousand, one hundred thirty-six".