721271892 has 24 divisors (see below), whose sum is σ = 1835965152. Its totient is φ = 218567200.

The previous prime is 721271891. The next prime is 721271893. The reversal of 721271892 is 298172127.

It is an interprime number because it is at equal distance from previous prime (721271891) and next prime (721271893).

It is a self number, because there is not a number n which added to its sum of digits gives 721271892.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721271891) 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, 2731959 + ... + 2732222.

It is an arithmetic number, because the mean of its divisors is an integer number (76498548).

Almost surely, 2^721271892 is an apocalyptic number.

It is an amenable number.

721271892 is an abundant number, since it is smaller than the sum of its proper divisors (1114693260).

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

721271892 is a wasteful number, since it uses less digits than its factorization.

721271892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5464199 (or 5464197 counting only the distinct ones).

The product of its digits is 28224, while the sum is 39.

The square root of 721271892 is about 26856.5055805851. The cubic root of 721271892 is about 896.8084039258.

The spelling of 721271892 in words is "seven hundred twenty-one million, two hundred seventy-one thousand, eight hundred ninety-two".