245347840 has 80 divisors (see below), whose sum is σ = 592194240. Its totient is φ = 97484800.

The previous prime is 245347829. The next prime is 245347847. The reversal of 245347840 is 48743542.

245347840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 245347840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245347847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611640 + ... + 612040.

It is an arithmetic number, because the mean of its divisors is an integer number (7402428).

Almost surely, 2^245347840 is an apocalyptic number.

245347840 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 245347840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296097120).

245347840 is an abundant number, since it is smaller than the sum of its proper divisors (346846400).

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

245347840 is an equidigital number, since it uses as much as digits as its factorization.

245347840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 37.

The square root of 245347840 is about 15663.5832426683. The cubic root of 245347840 is about 626.0284634923.

The spelling of 245347840 in words is "two hundred forty-five million, three hundred forty-seven thousand, eight hundred forty".