721277140 has 12 divisors (see below), whose sum is σ = 1514682036. Its totient is φ = 288510848.

The previous prime is 721277129. The next prime is 721277153. The reversal of 721277140 is 41772127.

It can be written as a sum of positive squares in 2 ways, for example, as 446645956 + 274631184 = 21134^2 + 16572^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18031909 + ... + 18031948.

It is an arithmetic number, because the mean of its divisors is an integer number (126223503).

Almost surely, 2^721277140 is an apocalyptic number.

It is an amenable number.

721277140 is an abundant number, since it is smaller than the sum of its proper divisors (793404896).

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

721277140 is a wasteful number, since it uses less digits than its factorization.

721277140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36063866 (or 36063864 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 31.

The square root of 721277140 is about 26856.6032848534. The cubic root of 721277140 is about 896.8105789905.

The spelling of 721277140 in words is "seven hundred twenty-one million, two hundred seventy-seven thousand, one hundred forty".