731242540 has 96 divisors (see below), whose sum is σ = 1825649280. Its totient is φ = 240715776.

The previous prime is 731242529. The next prime is 731242541. The reversal of 731242540 is 45242137.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 731242499 and 731242508.

It is not an unprimeable number, because it can be changed into a prime (731242541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 945594 + ... + 946366.

It is an arithmetic number, because the mean of its divisors is an integer number (19017180).

Almost surely, 2^731242540 is an apocalyptic number.

731242540 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 731242540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (912824640).

731242540 is an abundant number, since it is smaller than the sum of its proper divisors (1094406740).

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

731242540 is a wasteful number, since it uses less digits than its factorization.

731242540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051 (or 1049 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 731242540 is about 27041.4966301793. The cubic root of 731242540 is about 900.9219112886.

Adding to 731242540 its reverse (45242137), we get a palindrome (776484677).

The spelling of 731242540 in words is "seven hundred thirty-one million, two hundred forty-two thousand, five hundred forty".