245665640 has 64 divisors (see below), whose sum is σ = 638487360. Its totient is φ = 84075520.

The previous prime is 245665639. The next prime is 245665697. The reversal of 245665640 is 46566542.

245665640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 245665594 and 245665603.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8942 + ... + 23901.

It is an arithmetic number, because the mean of its divisors is an integer number (9976365).

Almost surely, 2^245665640 is an apocalyptic number.

245665640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245665640 is an abundant number, since it is smaller than the sum of its proper divisors (392821720).

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

245665640 is a wasteful number, since it uses less digits than its factorization.

245665640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32882 (or 32878 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The square root of 245665640 is about 15673.7245095095. The cubic root of 245665640 is about 626.2986458946.

The spelling of 245665640 in words is "two hundred forty-five million, six hundred sixty-five thousand, six hundred forty".