721403674 has 4 divisors (see below), whose sum is σ = 1082105514. Its totient is φ = 360701836.

The previous prime is 721403663. The next prime is 721403677. The reversal of 721403674 is 476304127.

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

It can be written as a sum of positive squares in only one way, i.e., 373842225 + 347561449 = 19335^2 + 18643^2 .

It is not an unprimeable number, because it can be changed into a prime (721403677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180350917 + ... + 180350920.

Almost surely, 2^721403674 is an apocalyptic number.

721403674 is a deficient number, since it is larger than the sum of its proper divisors (360701840).

721403674 is a wasteful number, since it uses less digits than its factorization.

721403674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360701839.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 721403674 is about 26858.9589150436. The cubic root of 721403674 is about 896.8630185630.

The spelling of 721403674 in words is "seven hundred twenty-one million, four hundred three thousand, six hundred seventy-four".