722755820 has 48 divisors (see below), whose sum is σ = 1609977600. Its totient is φ = 271776960.

The previous prime is 722755771. The next prime is 722755849. The reversal of 722755820 is 28557227.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42521 + ... + 57039.

It is an arithmetic number, because the mean of its divisors is an integer number (33541200).

Almost surely, 2^722755820 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 722755820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804988800).

722755820 is an abundant number, since it is smaller than the sum of its proper divisors (887221780).

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

722755820 is a wasteful number, since it uses less digits than its factorization.

722755820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14678 (or 14676 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 722755820 is about 26884.1183601025. The cubic root of 722755820 is about 897.4230068728.

The spelling of 722755820 in words is "seven hundred twenty-two million, seven hundred fifty-five thousand, eight hundred twenty".