245805890 has 32 divisors (see below), whose sum is σ = 511069824. Its totient is φ = 84125440.

The previous prime is 245805871. The next prime is 245805919. The reversal of 245805890 is 98508542.

245805890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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, 63854 + ... + 67593.

It is an arithmetic number, because the mean of its divisors is an integer number (15970932).

Almost surely, 2^245805890 is an apocalyptic number.

245805890 is an abundant number, since it is smaller than the sum of its proper divisors (265263934).

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

245805890 is a wasteful number, since it uses less digits than its factorization.

245805890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131482.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 245805890 is about 15678.1979194039. The cubic root of 245805890 is about 626.4178074167.

The spelling of 245805890 in words is "two hundred forty-five million, eight hundred five thousand, eight hundred ninety".