731638080 has 84 divisors (see below), whose sum is σ = 2516540052. Its totient is φ = 195102720.

The previous prime is 731638067. The next prime is 731638081. The reversal of 731638080 is 80836137.

731638080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 579461184 + 152176896 = 24072^2 + 12336^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731638081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124141 + ... + 129900.

Almost surely, 2^731638080 is an apocalyptic number.

It is an amenable number.

731638080 is an abundant number, since it is smaller than the sum of its proper divisors (1784901972).

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

731638080 is a wasteful number, since it uses less digits than its factorization.

731638080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254064 (or 254051 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 731638080 is about 27048.8092159341. The cubic root of 731638080 is about 901.0843227097.

The spelling of 731638080 in words is "seven hundred thirty-one million, six hundred thirty-eight thousand, eighty".