245775390 has 64 divisors (see below), whose sum is σ = 677154816. Its totient is φ = 55924992.

The previous prime is 245775389. The next prime is 245775421. The reversal of 245775390 is 93577542.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46419 + ... + 51441.

It is an arithmetic number, because the mean of its divisors is an integer number (10580544).

Almost surely, 2^245775390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 245775390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338577408).

245775390 is an abundant number, since it is smaller than the sum of its proper divisors (431379426).

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

245775390 is a wasteful number, since it uses less digits than its factorization.

245775390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5273.

The product of its (nonzero) digits is 264600, while the sum is 42.

The square root of 245775390 is about 15677.2252009085. The cubic root of 245775390 is about 626.3918973603.

It can be divided in two parts, 245 and 775390, that added together give a triangular number (775635 = T₁₂₄₅).

The spelling of 245775390 in words is "two hundred forty-five million, seven hundred seventy-five thousand, three hundred ninety".