2640688615720 has 32 divisors (see below), whose sum is σ = 5942393629920. Its totient is φ = 1056125358400.

The previous prime is 2640688615717. The next prime is 2640688615771. The reversal of 2640688615720 is 275168860462.

It is a super-2 number, since 2×2640688615720² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4405006 + ... + 4968445.

It is an arithmetic number, because the mean of its divisors is an integer number (185699800935).

Almost surely, 2^{2640688615720} is an apocalyptic number.

2640688615720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640688615720 is an abundant number, since it is smaller than the sum of its proper divisors (3301705014200).

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

2640688615720 is a wasteful number, since it uses less digits than its factorization.

2640688615720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9380505 (or 9380501 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 55.

It can be divided in two parts, 264068 and 8615720, that added together give a palindrome (8879788).

The spelling of 2640688615720 in words is "two trillion, six hundred forty billion, six hundred eighty-eight million, six hundred fifteen thousand, seven hundred twenty".