2566620 has 144 divisors (see below), whose sum is σ = 9384480. Its totient is φ = 580608.

The previous prime is 2566601. The next prime is 2566633. The reversal of 2566620 is 266652.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26412 + ... + 26508.

It is an arithmetic number, because the mean of its divisors is an integer number (65170).

2^2566620 is an apocalyptic number.

2566620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2566620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4692240).

2566620 is an abundant number, since it is smaller than the sum of its proper divisors (6817860).

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

2566620 is a wasteful number, since it uses less digits than its factorization.

2566620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 2566620 is about 1602.0674143119. The cubic root of 2566620 is about 136.9158913292.

Subtracting from 2566620 its reverse (266652), we obtain a cube (2299968 = 132³).

The spelling of 2566620 in words is "two million, five hundred sixty-six thousand, six hundred twenty".