2561239590 has 64 divisors (see below), whose sum is σ = 7565515776. Its totient is φ = 540392832.

The previous prime is 2561239559. The next prime is 2561239643. The reversal of 2561239590 is 959321652.

2561239590 is nontrivially palindromic in base 4.

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

It is a Curzon number.

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, 466362 + ... + 471821.

It is an arithmetic number, because the mean of its divisors is an integer number (118211184).

Almost surely, 2^2561239590 is an apocalyptic number.

2561239590 is an abundant number, since it is smaller than the sum of its proper divisors (5004276186).

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

2561239590 is a wasteful number, since it uses less digits than its factorization.

2561239590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938213.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 2561239590 is about 50608.6908544372. The cubic root of 2561239590 is about 1368.2015205758.

The spelling of 2561239590 in words is "two billion, five hundred sixty-one million, two hundred thirty-nine thousand, five hundred ninety".