2561990 has 8 divisors (see below), whose sum is σ = 4611600. Its totient is φ = 1024792.

The previous prime is 2561987. The next prime is 2562011. The reversal of 2561990 is 991652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128090 + ... + 128109.

It is an arithmetic number, because the mean of its divisors is an integer number (576450).

2^2561990 is an apocalyptic number.

2561990 is a deficient number, since it is larger than the sum of its proper divisors (2049610).

2561990 is a wasteful number, since it uses less digits than its factorization.

2561990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256206.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 2561990 is about 1600.6217541943. The cubic root of 2561990 is about 136.8335129298.

The spelling of 2561990 in words is "two million, five hundred sixty-one thousand, nine hundred ninety".