2640557040 has 80 divisors (see below), whose sum is σ = 8929892736. Its totient is φ = 640134400.

The previous prime is 2640557009. The next prime is 2640557107. The reversal of 2640557040 is 407550462.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 2640556992 and 2640557010.

It is a congruent number.

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, 497466 + ... + 502745.

Almost surely, 2^2640557040 is an apocalyptic number.

2640557040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640557040 is an abundant number, since it is smaller than the sum of its proper divisors (6289335696).

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

2640557040 is a wasteful number, since it uses less digits than its factorization.

2640557040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000238 (or 1000232 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 2640557040 is about 51386.3507168976. The cubic root of 2640557040 is about 1382.1818457863.

The spelling of 2640557040 in words is "two billion, six hundred forty million, five hundred fifty-seven thousand, forty".