672755728 has 10 divisors (see below), whose sum is σ = 1303464254. Its totient is φ = 336377856.

The previous prime is 672755689. The next prime is 672755729. The reversal of 672755728 is 827557276.

It can be written as a sum of positive squares in only one way, i.e., 621604624 + 51151104 = 24932^2 + 7152^2 .

It is not an unprimeable number, because it can be changed into a prime (672755729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21023601 + ... + 21023632.

Almost surely, 2^672755728 is an apocalyptic number.

It is an amenable number.

672755728 is a deficient number, since it is larger than the sum of its proper divisors (630708526).

672755728 is a wasteful number, since it uses less digits than its factorization.

672755728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42047241 (or 42047235 counting only the distinct ones).

The product of its digits is 1646400, while the sum is 49.

The square root of 672755728 is about 25937.5351180485. The cubic root of 672755728 is about 876.2320507271.

The spelling of 672755728 in words is "six hundred seventy-two million, seven hundred fifty-five thousand, seven hundred twenty-eight".