672749251 has 4 divisors (see below), whose sum is σ = 673561600. Its totient is φ = 671936904.

The previous prime is 672749249. The next prime is 672749261. The reversal of 672749251 is 152947276.

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

It is a cyclic number.

It is not a de Polignac number, because 672749251 - 2¹ = 672749249 is a prime.

It is a super-2 number, since 2×672749251² = 905183109442122002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 672749198 and 672749207.

It is not an unprimeable number, because it can be changed into a prime (672749261) 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, 404931 + ... + 406588.

It is an arithmetic number, because the mean of its divisors is an integer number (168390400).

Almost surely, 2^672749251 is an apocalyptic number.

672749251 is a deficient number, since it is larger than the sum of its proper divisors (812349).

672749251 is an equidigital number, since it uses as much as digits as its factorization.

672749251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812348.

The product of its digits is 211680, while the sum is 43.

The square root of 672749251 is about 25937.4102600857. The cubic root of 672749251 is about 876.2292387241.

The spelling of 672749251 in words is "six hundred seventy-two million, seven hundred forty-nine thousand, two hundred fifty-one".