721360540 has 12 divisors (see below), whose sum is σ = 1514857176. Its totient is φ = 288544208.

The previous prime is 721360501. The next prime is 721360543. The reversal of 721360540 is 45063127.

It is a super-2 number, since 2×721360540² = 1040722057338183200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 721360499 and 721360508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721360543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18033994 + ... + 18034033.

It is an arithmetic number, because the mean of its divisors is an integer number (126238098).

Almost surely, 2^721360540 is an apocalyptic number.

It is an amenable number.

721360540 is an abundant number, since it is smaller than the sum of its proper divisors (793496636).

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

721360540 is a wasteful number, since it uses less digits than its factorization.

721360540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36068036 (or 36068034 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 721360540 is about 26858.1559307410. The cubic root of 721360540 is about 896.8451431987.

The spelling of 721360540 in words is "seven hundred twenty-one million, three hundred sixty thousand, five hundred forty".