721672274 has 8 divisors (see below), whose sum is σ = 1102933260. Its totient is φ = 354027856.

The previous prime is 721672261. The next prime is 721672277. The reversal of 721672274 is 472276127.

It can be written as a sum of positive squares in 2 ways, for example, as 675636049 + 46036225 = 25993^2 + 6785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3404009 + ... + 3404220.

Almost surely, 2^721672274 is an apocalyptic number.

721672274 is a deficient number, since it is larger than the sum of its proper divisors (381260986).

721672274 is a wasteful number, since it uses less digits than its factorization.

721672274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6808284.

The product of its digits is 65856, while the sum is 38.

The square root of 721672274 is about 26863.9586435060. The cubic root of 721672274 is about 896.9743143252.

The spelling of 721672274 in words is "seven hundred twenty-one million, six hundred seventy-two thousand, two hundred seventy-four".