2564890 has 8 divisors (see below), whose sum is σ = 4616820. Its totient is φ = 1025952.

The previous prime is 2564857. The next prime is 2564899. The reversal of 2564890 is 984652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2380849 + 184041 = 1543^2 + 429^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2564899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128235 + ... + 128254.

2^2564890 is an apocalyptic number.

2564890 is a deficient number, since it is larger than the sum of its proper divisors (2051930).

2564890 is a wasteful number, since it uses less digits than its factorization.

2564890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256496.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 2564890 is about 1601.5273959567. The cubic root of 2564890 is about 136.8851222333.

The spelling of 2564890 in words is "two million, five hundred sixty-four thousand, eight hundred ninety".