721472215 has 4 divisors (see below), whose sum is σ = 865766664. Its totient is φ = 577177768.

The previous prime is 721472201. The next prime is 721472233. The reversal of 721472215 is 512274127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 721472215 - 2⁵ = 721472183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72147217 + ... + 72147226.

It is an arithmetic number, because the mean of its divisors is an integer number (216441666).

Almost surely, 2^721472215 is an apocalyptic number.

721472215 is a deficient number, since it is larger than the sum of its proper divisors (144294449).

721472215 is a wasteful number, since it uses less digits than its factorization.

721472215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144294448.

The product of its digits is 7840, while the sum is 31.

The square root of 721472215 is about 26860.2348277151. The cubic root of 721472215 is about 896.8914214964.

The spelling of 721472215 in words is "seven hundred twenty-one million, four hundred seventy-two thousand, two hundred fifteen".