721452086520 has 64 divisors (see below), whose sum is σ = 2361115923840. Its totient is φ = 174897475200.

The previous prime is 721452086519. The next prime is 721452086521. The reversal of 721452086520 is 25680254127.

It is an interprime number because it is at equal distance from previous prime (721452086519) and next prime (721452086521).

It is a super-2 number, since 2×721452086520² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721452086521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273275986 + ... + 273278625.

It is an arithmetic number, because the mean of its divisors is an integer number (36892436310).

Almost surely, 2^721452086520 is an apocalyptic number.

It is an amenable number.

721452086520 is an abundant number, since it is smaller than the sum of its proper divisors (1639663837320).

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

721452086520 is a wasteful number, since it uses less digits than its factorization.

721452086520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546554636 (or 546554632 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The spelling of 721452086520 in words is "seven hundred twenty-one billion, four hundred fifty-two million, eighty-six thousand, five hundred twenty".