672172687 has 4 divisors (see below), whose sum is σ = 672240136. Its totient is φ = 672105240.

The previous prime is 672172679. The next prime is 672172763. The reversal of 672172687 is 786271276.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 672172687 - 2³ = 672172679 is a prime.

It is a super-2 number, since 2×672172687² = 903632242297599938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672172607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15489 + ... + 39802.

It is an arithmetic number, because the mean of its divisors is an integer number (168060034).

Almost surely, 2^672172687 is an apocalyptic number.

672172687 is a deficient number, since it is larger than the sum of its proper divisors (67449).

672172687 is a wasteful number, since it uses less digits than its factorization.

672172687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67448.

The product of its digits is 395136, while the sum is 46.

The square root of 672172687 is about 25926.2933525022. The cubic root of 672172687 is about 875.9788499269.

The spelling of 672172687 in words is "six hundred seventy-two million, one hundred seventy-two thousand, six hundred eighty-seven".