722618820 has 288 divisors, whose sum is σ = 2835495936. Its totient is φ = 150076800.

The previous prime is 722618803. The next prime is 722618821. The reversal of 722618820 is 28816227.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (722618821) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 373255 + ... + 375185.

It is an arithmetic number, because the mean of its divisors is an integer number (9845472).

Almost surely, 2^722618820 is an apocalyptic number.

722618820 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 722618820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1417747968).

722618820 is an abundant number, since it is smaller than the sum of its proper divisors (2112877116).

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

722618820 is a wasteful number, since it uses less digits than its factorization.

722618820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973 (or 1959 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 722618820 is about 26881.5702666344. The cubic root of 722618820 is about 897.3663004363.

The spelling of 722618820 in words is "seven hundred twenty-two million, six hundred eighteen thousand, eight hundred twenty".