721416052 has 24 divisors (see below), whose sum is σ = 1443792896. Its totient is φ = 308972448.

The previous prime is 721416037. The next prime is 721416053. The reversal of 721416052 is 250614127.

It is a super-2 number, since 2×721416052² = 1040882240166533408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 721416052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721416053) 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, 38818 + ... + 54310.

Almost surely, 2^721416052 is an apocalyptic number.

It is an amenable number.

721416052 is an abundant number, since it is smaller than the sum of its proper divisors (722376844).

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

721416052 is a wasteful number, since it uses less digits than its factorization.

721416052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17167 (or 17165 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 721416052 is about 26859.1893399633. The cubic root of 721416052 is about 896.8681480568.

The spelling of 721416052 in words is "seven hundred twenty-one million, four hundred sixteen thousand, fifty-two".