731220540 has 24 divisors (see below), whose sum is σ = 2047417680. Its totient is φ = 194992128.

The previous prime is 731220533. The next prime is 731220569. The reversal of 731220540 is 45022137.

731220540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 731220540.

It is a congruent number.

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, 6093445 + ... + 6093564.

It is an arithmetic number, because the mean of its divisors is an integer number (85309070).

Almost surely, 2^731220540 is an apocalyptic number.

It is an amenable number.

731220540 is an abundant number, since it is smaller than the sum of its proper divisors (1316197140).

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

731220540 is a wasteful number, since it uses less digits than its factorization.

731220540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12187021 (or 12187019 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 731220540 is about 27041.0898449009. The cubic root of 731220540 is about 900.9128762194.

Adding to 731220540 its reverse (45022137), we get a palindrome (776242677).

The spelling of 731220540 in words is "seven hundred thirty-one million, two hundred twenty thousand, five hundred forty".