721315276 has 12 divisors (see below), whose sum is σ = 1377056520. Its totient is φ = 327870560.

The previous prime is 721315237. The next prime is 721315279. The reversal of 721315276 is 672513127.

It is not an unprimeable number, because it can be changed into a prime (721315279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8196721 + ... + 8196808.

It is an arithmetic number, because the mean of its divisors is an integer number (114754710).

Almost surely, 2^721315276 is an apocalyptic number.

It is an amenable number.

721315276 is a deficient number, since it is larger than the sum of its proper divisors (655741244).

721315276 is a wasteful number, since it uses less digits than its factorization.

721315276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16393544 (or 16393542 counting only the distinct ones).

The product of its digits is 17640, while the sum is 34.

The square root of 721315276 is about 26857.3132684563. The cubic root of 721315276 is about 896.8263843648.

The spelling of 721315276 in words is "seven hundred twenty-one million, three hundred fifteen thousand, two hundred seventy-six".