672739728 has 40 divisors (see below), whose sum is σ = 1738841088. Its totient is φ = 224126592.

The previous prime is 672739699. The next prime is 672739741. The reversal of 672739728 is 827937276.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167601 + ... + 171567.

Almost surely, 2^672739728 is an apocalyptic number.

It is an amenable number.

672739728 is an abundant number, since it is smaller than the sum of its proper divisors (1066101360).

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

672739728 is a wasteful number, since it uses less digits than its factorization.

672739728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7511 (or 7505 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 51.

The square root of 672739728 is about 25937.2266828973. The cubic root of 672739728 is about 876.2251042613.

The spelling of 672739728 in words is "six hundred seventy-two million, seven hundred thirty-nine thousand, seven hundred twenty-eight".