672733638 has 12 divisors (see below), whose sum is σ = 1457589588. Its totient is φ = 224244540.

The previous prime is 672733637. The next prime is 672733643. The reversal of 672733638 is 836337276.

672733638 is a `hidden beast` number, since 6 + 7 + 2 + 7 + 3 + 3 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 672733593 and 672733602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672733637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18687028 + ... + 18687063.

It is an arithmetic number, because the mean of its divisors is an integer number (121465799).

Almost surely, 2^672733638 is an apocalyptic number.

672733638 is an abundant number, since it is smaller than the sum of its proper divisors (784855950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

672733638 is a wasteful number, since it uses less digits than its factorization.

672733638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37374099 (or 37374096 counting only the distinct ones).

The product of its digits is 762048, while the sum is 45.

The square root of 672733638 is about 25937.1092838042. The cubic root of 672733638 is about 876.2224602338. Note that the first 3 decimals are identical.

The spelling of 672733638 in words is "six hundred seventy-two million, seven hundred thirty-three thousand, six hundred thirty-eight".