2640620 has 24 divisors (see below), whose sum is σ = 5838000. Its totient is φ = 1000512.

The previous prime is 2640581. The next prime is 2640643. The reversal of 2640620 is 260462.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2640592 and 2640601.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3095 + ... + 3854.

It is an arithmetic number, because the mean of its divisors is an integer number (243250).

2^2640620 is an apocalyptic number.

2640620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640620 is an abundant number, since it is smaller than the sum of its proper divisors (3197380).

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

2640620 is a wasteful number, since it uses less digits than its factorization.

2640620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6977 (or 6975 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2640620 is about 1624.9984615377. The cubic root of 2640620 is about 138.2192831029.

The spelling of 2640620 in words is "two million, six hundred forty thousand, six hundred twenty".