731030040 has 192 divisors, whose sum is σ = 2575722240. Its totient is φ = 178744320.

The previous prime is 731030033. The next prime is 731030063. The reversal of 731030040 is 40030137.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 731029995 and 731030022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 846649 + ... + 847511.

It is an arithmetic number, because the mean of its divisors is an integer number (13415220).

Almost surely, 2^731030040 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 731030040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1287861120).

731030040 is an abundant number, since it is smaller than the sum of its proper divisors (1844692200).

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

731030040 is a wasteful number, since it uses less digits than its factorization.

731030040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 731030040 is about 27037.5671982521. The cubic root of 731030040 is about 900.8346331543.

Adding to 731030040 its reverse (40030137), we get a palindrome (771060177).

The spelling of 731030040 in words is "seven hundred thirty-one million, thirty thousand, forty".