672640417 has 8 divisors (see below), whose sum is σ = 679374080. Its totient is φ = 665917200.

The previous prime is 672640391. The next prime is 672640433. The reversal of 672640417 is 714046276.

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 672640417 - 2⁷ = 672640289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672640447) 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, 211078 + ... + 214240.

It is an arithmetic number, because the mean of its divisors is an integer number (84921760).

Almost surely, 2^672640417 is an apocalyptic number.

It is an amenable number.

672640417 is a deficient number, since it is larger than the sum of its proper divisors (6733663).

672640417 is a wasteful number, since it uses less digits than its factorization.

672640417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5223.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 672640417 is about 25935.3121631493. The cubic root of 672640417 is about 876.1819855186.

The spelling of 672640417 in words is "six hundred seventy-two million, six hundred forty thousand, four hundred seventeen".