2640542436 has 96 divisors (see below), whose sum is σ = 7875983360. Its totient is φ = 749412000.

The previous prime is 2640542413. The next prime is 2640542449. The reversal of 2640542436 is 6342450462.

2640542436 is a `hidden beast` number, since 2 + 6 + 405 + 4 + 243 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2640542436.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102591 + ... + 125721.

Almost surely, 2^2640542436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640542436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3937991680).

2640542436 is an abundant number, since it is smaller than the sum of its proper divisors (5235440924).

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

2640542436 is a wasteful number, since it uses less digits than its factorization.

2640542436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23302 (or 23294 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The square root of 2640542436 is about 51386.2086167096. The cubic root of 2640542436 is about 1382.1792976597.

Adding to 2640542436 its reverse (6342450462), we get a palindrome (8982992898).

The spelling of 2640542436 in words is "two billion, six hundred forty million, five hundred forty-two thousand, four hundred thirty-six".