721327572 has 96 divisors (see below), whose sum is σ = 2142201600. Its totient is φ = 205618176.

The previous prime is 721327567. The next prime is 721327583. The reversal of 721327572 is 275723127.

721327572 is a `hidden beast` number, since 72 + 13 + 2 + 7 + 572 = 666.

It is a super-2 number, since 2×721327572² = 1040626932254830368, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 447504 + ... + 449112.

It is an arithmetic number, because the mean of its divisors is an integer number (22314600).

Almost surely, 2^721327572 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 721327572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071100800).

721327572 is an abundant number, since it is smaller than the sum of its proper divisors (1420874028).

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

721327572 is a wasteful number, since it uses less digits than its factorization.

721327572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222 (or 2214 counting only the distinct ones).

The product of its digits is 41160, while the sum is 36.

The square root of 721327572 is about 26857.5421809219. The cubic root of 721327572 is about 896.8314802939.

The spelling of 721327572 in words is "seven hundred twenty-one million, three hundred twenty-seven thousand, five hundred seventy-two".