245315640 has 128 divisors (see below), whose sum is σ = 767880000. Its totient is φ = 62619648.

The previous prime is 245315633. The next prime is 245315647. The reversal of 245315640 is 46513542.

It is an interprime number because it is at equal distance from previous prime (245315633) and next prime (245315647).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 245315598 and 245315607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245315647) 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, 546136 + ... + 546584.

Almost surely, 2^245315640 is an apocalyptic number.

245315640 is a gapful number since it is divisible by the number (20) 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 245315640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383940000).

245315640 is an abundant number, since it is smaller than the sum of its proper divisors (522564360).

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

245315640 is a wasteful number, since it uses less digits than its factorization.

245315640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 245315640 is about 15662.5553470690. Note that the first 3 decimals coincide. The cubic root of 245315640 is about 626.0010751682.

The spelling of 245315640 in words is "two hundred forty-five million, three hundred fifteen thousand, six hundred forty".