722421504 has 378 divisors, whose sum is σ = 2546864880. Its totient is φ = 203793408.

The previous prime is 722421493. The next prime is 722421509. The reversal of 722421504 is 405124227.

It is a tau number, because it is divible by the number of its divisors (378).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722421509) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 9144537 + ... + 9144615.

Almost surely, 2^722421504 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 722421504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273432440).

722421504 is an abundant number, since it is smaller than the sum of its proper divisors (1824443376).

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

722421504 is an frugal number, since it uses more digits than its factorization.

722421504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 722421504 is about 26877.8999179623. The cubic root of 722421504 is about 897.2846156703.

The spelling of 722421504 in words is "seven hundred twenty-two million, four hundred twenty-one thousand, five hundred four".