2636534640 has 40 divisors (see below), whose sum is σ = 8173258128. Its totient is φ = 703075840.

The previous prime is 2636534611. The next prime is 2636534647. The reversal of 2636534640 is 464356362.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2636534647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5492541 + ... + 5493020.

Almost surely, 2^2636534640 is an apocalyptic number.

2636534640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2636534640 is an abundant number, since it is smaller than the sum of its proper divisors (5536723488).

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

2636534640 is a wasteful number, since it uses less digits than its factorization.

2636534640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10985577 (or 10985571 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 39.

The square root of 2636534640 is about 51347.1970023681. The cubic root of 2636534640 is about 1381.4796563598.

The spelling of 2636534640 in words is "two billion, six hundred thirty-six million, five hundred thirty-four thousand, six hundred forty".