2640207500 has 60 divisors (see below), whose sum is σ = 6598450320. Its totient is φ = 905208000.

The previous prime is 2640207487. The next prime is 2640207509. The reversal of 2640207500 is 57020462.

It is a self number, because there is not a number n which added to its sum of digits gives 2640207500.

It is not an unprimeable number, because it can be changed into a prime (2640207509) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 57935 + ... + 92934.

It is an arithmetic number, because the mean of its divisors is an integer number (109974172).

Almost surely, 2^2640207500 is an apocalyptic number.

2640207500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640207500 is an abundant number, since it is smaller than the sum of its proper divisors (3958242820).

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

2640207500 is a wasteful number, since it uses less digits than its factorization.

2640207500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150900 (or 150883 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 2640207500 is about 51382.9495066214. The cubic root of 2640207500 is about 1382.1208549733.

Adding to 2640207500 its reverse (57020462), we get a palindrome (2697227962).

The spelling of 2640207500 in words is "two billion, six hundred forty million, two hundred seven thousand, five hundred".