722711640 has 128 divisors (see below), whose sum is σ = 2484840960. Its totient is φ = 164726784.

The previous prime is 722711629. The next prime is 722711641. The reversal of 722711640 is 46117227.

It is a super-2 number, since 2×722711640² = 1044624229182979200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 722711598 and 722711607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722711641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 362727 + ... + 364713.

It is an arithmetic number, because the mean of its divisors is an integer number (19412820).

Almost surely, 2^722711640 is an apocalyptic number.

722711640 is a gapful number since it is divisible by the number (70) 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 722711640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1242420480).

722711640 is an abundant number, since it is smaller than the sum of its proper divisors (1762129320).

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

722711640 is a wasteful number, since it uses less digits than its factorization.

722711640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441 (or 2437 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 722711640 is about 26883.2966728413. The cubic root of 722711640 is about 897.4047208647.

Adding to 722711640 its reverse (46117227), we get a palindrome (768828867).

The spelling of 722711640 in words is "seven hundred twenty-two million, seven hundred eleven thousand, six hundred forty".