721312280 has 48 divisors (see below), whose sum is σ = 1757414880. Its totient is φ = 266328192.

The previous prime is 721312279. The next prime is 721312349. The reversal of 721312280 is 82213127.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46592 + ... + 60111.

It is an arithmetic number, because the mean of its divisors is an integer number (36612810).

Almost surely, 2^721312280 is an apocalyptic number.

It is an amenable number.

721312280 is an abundant number, since it is smaller than the sum of its proper divisors (1036102600).

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

721312280 is a wasteful number, since it uses less digits than its factorization.

721312280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106740 (or 106723 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 721312280 is about 26857.2574921566. The cubic root of 721312280 is about 896.8251426999.

The spelling of 721312280 in words is "seven hundred twenty-one million, three hundred twelve thousand, two hundred eighty".