672697991 has 8 divisors (see below), whose sum is σ = 769241760. Its totient is φ = 576265248.

The previous prime is 672697957. The next prime is 672698003. The reversal of 672697991 is 199796276.

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

It is a cyclic number.

It is not a de Polignac number, because 672697991 - 2¹⁰ = 672696967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672697391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14336 + ... + 39381.

It is an arithmetic number, because the mean of its divisors is an integer number (96155220).

Almost surely, 2^672697991 is an apocalyptic number.

672697991 is a deficient number, since it is larger than the sum of its proper divisors (96543769).

672697991 is a wasteful number, since it uses less digits than its factorization.

672697991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55513.

The product of its digits is 2571912, while the sum is 56.

The square root of 672697991 is about 25936.4220932649. The cubic root of 672697991 is about 876.2069834527.

The spelling of 672697991 in words is "six hundred seventy-two million, six hundred ninety-seven thousand, nine hundred ninety-one".