731328840 has 288 divisors, whose sum is σ = 2654084160. Its totient is φ = 174493440.

The previous prime is 731328823. The next prime is 731328847. The reversal of 731328840 is 48823137.

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

It is a junction number, because it is equal to n+sod(n) for n = 731328795 and 731328804.

It is not an unprimeable number, because it can be changed into a prime (731328847) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4486599 + ... + 4486761.

It is an arithmetic number, because the mean of its divisors is an integer number (9215570).

Almost surely, 2^731328840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 731328840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1327042080).

731328840 is an abundant number, since it is smaller than the sum of its proper divisors (1922755320).

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

731328840 is a wasteful number, since it uses less digits than its factorization.

731328840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 731328840 is about 27043.0922788057. The cubic root of 731328840 is about 900.9573516513.

The spelling of 731328840 in words is "seven hundred thirty-one million, three hundred twenty-eight thousand, eight hundred forty".