2640606220 has 48 divisors (see below), whose sum is σ = 6361104960. Its totient is φ = 901972224.

The previous prime is 2640606203. The next prime is 2640606259. The reversal of 2640606220 is 226060462.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2602 + ... + 72718.

It is an arithmetic number, because the mean of its divisors is an integer number (132523020).

Almost surely, 2^2640606220 is an apocalyptic number.

2640606220 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 2640606220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3180552480).

2640606220 is an abundant number, since it is smaller than the sum of its proper divisors (3720498740).

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

2640606220 is a wasteful number, since it uses less digits than its factorization.

2640606220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70402 (or 70400 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 2640606220 is about 51386.8292464129. The cubic root of 2640606220 is about 1382.1904267132.

Adding to 2640606220 its reverse (226060462), we get a palindrome (2866666682).

The spelling of 2640606220 in words is "two billion, six hundred forty million, six hundred six thousand, two hundred twenty".