721131874 has 48 divisors (see below), whose sum is σ = 1184752296. Its totient is φ = 329011200.

The previous prime is 721131869. The next prime is 721131881. The reversal of 721131874 is 478131127.

It can be written as a sum of positive squares in 12 ways, for example, as 55130625 + 666001249 = 7425^2 + 25807^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

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 23 ways as a sum of consecutive naturals, for example, 3984064 + ... + 3984244.

Almost surely, 2^721131874 is an apocalyptic number.

721131874 is a deficient number, since it is larger than the sum of its proper divisors (463620422).

721131874 is a wasteful number, since it uses less digits than its factorization.

721131874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 374 counting only the distinct ones).

The product of its digits is 9408, while the sum is 34.

The square root of 721131874 is about 26853.8986741218. The cubic root of 721131874 is about 896.7503687397.

The spelling of 721131874 in words is "seven hundred twenty-one million, one hundred thirty-one thousand, eight hundred seventy-four".