721674 has 12 divisors (see below), whose sum is σ = 1563666. Its totient is φ = 240552.

The previous prime is 721663. The next prime is 721687. The reversal of 721674 is 476127.

It can be written as a sum of positive squares in only one way, i.e., 710649 + 11025 = 843^2 + 105^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20029 + ... + 20064.

2⁷²¹⁶⁷⁴ is an apocalyptic number.

721674 is an abundant number, since it is smaller than the sum of its proper divisors (841992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721674 is a wasteful number, since it uses less digits than its factorization.

721674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40101 (or 40098 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 721674 is about 849.5139786961. The cubic root of 721674 is about 89.6975029413.

The spelling of 721674 in words is "seven hundred twenty-one thousand, six hundred seventy-four".