721672275 has 12 divisors (see below), whose sum is σ = 1193164952. Its totient is φ = 384891840.

The previous prime is 721672261. The next prime is 721672277. The reversal of 721672275 is 572276127.

It is not a de Polignac number, because 721672275 - 2⁵ = 721672243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721672277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4811074 + ... + 4811223.

Almost surely, 2^721672275 is an apocalyptic number.

721672275 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

721672275 is a deficient number, since it is larger than the sum of its proper divisors (471492677).

721672275 is a wasteful number, since it uses less digits than its factorization.

721672275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9622310 (or 9622305 counting only the distinct ones).

The product of its digits is 82320, while the sum is 39.

The square root of 721672275 is about 26863.9586621183. The cubic root of 721672275 is about 896.9743147395.

The spelling of 721672275 in words is "seven hundred twenty-one million, six hundred seventy-two thousand, two hundred seventy-five".