672748138 has 8 divisors (see below), whose sum is σ = 1025665380. Its totient is φ = 330859680.

The previous prime is 672748127. The next prime is 672748147. The reversal of 672748138 is 831847276.

It can be written as a sum of positive squares in 2 ways, for example, as 668894769 + 3853369 = 25863^2 + 1963^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2757043 + ... + 2757286.

Almost surely, 2^672748138 is an apocalyptic number.

672748138 is a deficient number, since it is larger than the sum of its proper divisors (352917242).

672748138 is a wasteful number, since it uses less digits than its factorization.

672748138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5514392.

The product of its digits is 451584, while the sum is 46.

The square root of 672748138 is about 25937.3888045809. The cubic root of 672748138 is about 876.2287555111.

The spelling of 672748138 in words is "six hundred seventy-two million, seven hundred forty-eight thousand, one hundred thirty-eight".