724298640 has 160 divisors (see below), whose sum is σ = 2429844480. Its totient is φ = 177420288.

The previous prime is 724298633. The next prime is 724298647. The reversal of 724298640 is 46892427.

It is an interprime number because it is at equal distance from previous prime (724298633) and next prime (724298647).

It is a junction number, because it is equal to n+sod(n) for n = 724298592 and 724298601.

It is not an unprimeable number, because it can be changed into a prime (724298647) 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, 838849 + ... + 839711.

It is an arithmetic number, because the mean of its divisors is an integer number (15186528).

Almost surely, 2^724298640 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 724298640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1214922240).

724298640 is an abundant number, since it is smaller than the sum of its proper divisors (1705545840).

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

724298640 is a wasteful number, since it uses less digits than its factorization.

724298640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161 (or 1155 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 724298640 is about 26912.7969560951. The cubic root of 724298640 is about 898.0611099561.

The spelling of 724298640 in words is "seven hundred twenty-four million, two hundred ninety-eight thousand, six hundred forty".