721457652 has 24 divisors (see below), whose sum is σ = 1756593216. Its totient is φ = 230029888.

The previous prime is 721457651. The next prime is 721457657. The reversal of 721457652 is 256754127.

It is a super-2 number, since 2×721457652² = 1041002287258706208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 721457652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721457651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1306713 + ... + 1307264.

It is an arithmetic number, because the mean of its divisors is an integer number (73191384).

Almost surely, 2^721457652 is an apocalyptic number.

It is an amenable number.

721457652 is an abundant number, since it is smaller than the sum of its proper divisors (1035135564).

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

721457652 is a wasteful number, since it uses less digits than its factorization.

721457652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614007 (or 2614005 counting only the distinct ones).

The product of its digits is 117600, while the sum is 39.

The square root of 721457652 is about 26859.9637378757. The cubic root of 721457652 is about 896.8853868368.

It can be divided in two parts, 72145 and 7652, that added together give a palindrome (79797).

The spelling of 721457652 in words is "seven hundred twenty-one million, four hundred fifty-seven thousand, six hundred fifty-two".