721270313280 has 252 divisors, whose sum is σ = 2726907295476. Its totient is φ = 174853324800.

The previous prime is 721270313273. The next prime is 721270313293. The reversal of 721270313280 is 82313072127.

721270313280 is a `hidden beast` number, since 72 + 1 + 270 + 313 + 2 + 8 + 0 = 666.

721270313280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 474412378176 + 246857935104 = 688776^2 + 496848^2 .

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 35 ways as a sum of consecutive naturals, for example, 686401 + ... + 1383360.

Almost surely, 2^721270313280 is an apocalyptic number.

It is an amenable number.

721270313280 is an abundant number, since it is smaller than the sum of its proper divisors (2005636982196).

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

721270313280 is a wasteful number, since it uses less digits than its factorization.

721270313280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069806 (or 2069782 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 721270313280 in words is "seven hundred twenty-one billion, two hundred seventy million, three hundred thirteen thousand, two hundred eighty".