672143985 has 24 divisors (see below), whose sum is σ = 1168252800. Its totient is φ = 357491232.

The previous prime is 672143963. The next prime is 672143987. The reversal of 672143985 is 589341276.

It is a de Polignac number, because none of the positive numbers 2^k-672143985 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 672143985.

It is not an unprimeable number, because it can be changed into a prime (672143987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3835 + ... + 36864.

It is an arithmetic number, because the mean of its divisors is an integer number (48677200).

Almost surely, 2^672143985 is an apocalyptic number.

It is an amenable number.

672143985 is a deficient number, since it is larger than the sum of its proper divisors (496108815).

672143985 is a wasteful number, since it uses less digits than its factorization.

672143985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41077 (or 41074 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 672143985 is about 25925.7398158664. The cubic root of 672143985 is about 875.9663815521.

The spelling of 672143985 in words is "six hundred seventy-two million, one hundred forty-three thousand, nine hundred eighty-five".