245806638 has 144 divisors (see below), whose sum is σ = 665241984. Its totient is φ = 59861760.

The previous prime is 245806607. The next prime is 245806679. The reversal of 245806638 is 836608542.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 245806638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 934495 + ... + 934757.

It is an arithmetic number, because the mean of its divisors is an integer number (4619736).

Almost surely, 2^245806638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 245806638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332620992).

245806638 is an abundant number, since it is smaller than the sum of its proper divisors (419435346).

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

245806638 is a wasteful number, since it uses less digits than its factorization.

245806638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 245806638 is about 15678.2217741681. The cubic root of 245806638 is about 626.4184428233.

The spelling of 245806638 in words is "two hundred forty-five million, eight hundred six thousand, six hundred thirty-eight".