721191232 has 14 divisors (see below), whose sum is σ = 1431113978. Its totient is φ = 360595584.

The previous prime is 721191203. The next prime is 721191241. The reversal of 721191232 is 232191127.

It can be written as a sum of positive squares in only one way, i.e., 383219776 + 337971456 = 19576^2 + 18384^2 .

It is a super-2 number, since 2×721191232² = 1040233586227355648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 721191232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5634243 + ... + 5634370.

It is an arithmetic number, because the mean of its divisors is an integer number (102222427).

Almost surely, 2^721191232 is an apocalyptic number.

It is an amenable number.

721191232 is a deficient number, since it is larger than the sum of its proper divisors (709922746).

721191232 is a wasteful number, since it uses less digits than its factorization.

721191232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11268625 (or 11268615 counting only the distinct ones).

The product of its digits is 1512, while the sum is 28.

The square root of 721191232 is about 26855.0038540306. The cubic root of 721191232 is about 896.7749725835.

The spelling of 721191232 in words is "seven hundred twenty-one million, one hundred ninety-one thousand, two hundred thirty-two".