674092721 has 4 divisors (see below), whose sum is σ = 713745252. Its totient is φ = 634440192.

The previous prime is 674092709. The next prime is 674092739. The reversal of 674092721 is 127290476.

674092721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 615784225 + 58308496 = 24815^2 + 7636^2 .

It is a cyclic number.

It is not a de Polignac number, because 674092721 - 2²² = 669898417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (674092921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19826240 + ... + 19826273.

It is an arithmetic number, because the mean of its divisors is an integer number (178436313).

Almost surely, 2^674092721 is an apocalyptic number.

It is an amenable number.

674092721 is a deficient number, since it is larger than the sum of its proper divisors (39652531).

674092721 is a wasteful number, since it uses less digits than its factorization.

674092721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39652530.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 674092721 is about 25963.2956498207. The cubic root of 674092721 is about 876.8121230371.

The spelling of 674092721 in words is "six hundred seventy-four million, ninety-two thousand, seven hundred twenty-one".