2645991488 has 28 divisors (see below), whose sum is σ = 6000731712. Its totient is φ = 1133996160.

The previous prime is 2645991487. The next prime is 2645991497. The reversal of 2645991488 is 8841995462.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (2645991487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2952668 + ... + 2953563.

Almost surely, 2^2645991488 is an apocalyptic number.

2645991488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2645991488 is an abundant number, since it is smaller than the sum of its proper divisors (3354740224).

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

2645991488 is an equidigital number, since it uses as much as digits as its factorization.

2645991488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5906250 (or 5906240 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 56.

The square root of 2645991488 is about 51439.2018600600. The cubic root of 2645991488 is about 1383.1294044703.

The spelling of 2645991488 in words is "two billion, six hundred forty-five million, nine hundred ninety-one thousand, four hundred eighty-eight".