2645265840 has 80 divisors (see below), whose sum is σ = 9371804928. Its totient is φ = 604631808.

The previous prime is 2645265817. The next prime is 2645265853. The reversal of 2645265840 is 485625462.

It is a happy number.

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 (42).

It is a junction number, because it is equal to n+sod(n) for n = 2645265792 and 2645265801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 785602 + ... + 788961.

Almost surely, 2^2645265840 is an apocalyptic number.

2645265840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2645265840 is an abundant number, since it is smaller than the sum of its proper divisors (6726539088).

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

2645265840 is a wasteful number, since it uses less digits than its factorization.

2645265840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574586 (or 1574580 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 42.

The square root of 2645265840 is about 51432.1479232590. The cubic root of 2645265840 is about 1383.0029544730.

The spelling of 2645265840 in words is "two billion, six hundred forty-five million, two hundred sixty-five thousand, eight hundred forty".