5206643640 has 96 divisors (see below), whose sum is σ = 18459932400. Its totient is φ = 1262215680.

The previous prime is 5206643621. The next prime is 5206643671. The reversal of 5206643640 is 463466025.

5206643640 is a `hidden beast` number, since 5 + 2 + 0 + 6 + 6 + 4 + 3 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 5206643595 and 5206643604.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 653445 + ... + 661364.

Almost surely, 2^5206643640 is an apocalyptic number.

It is an amenable number.

5206643640 is an abundant number, since it is smaller than the sum of its proper divisors (13253288760).

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

5206643640 is a wasteful number, since it uses less digits than its factorization.

5206643640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314837 (or 1314830 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 5206643640 is about 72157.0761602769. The cubic root of 5206643640 is about 1733.2157147343.

It can be divided in two parts, 5206 and 643640, that added together give a palindrome (648846).

The spelling of 5206643640 in words is "five billion, two hundred six million, six hundred forty-three thousand, six hundred forty".