6436699840 has 28 divisors (see below), whose sum is σ = 15327392256. Its totient is φ = 2574679808.

The previous prime is 6436699837. The next prime is 6436699847. The reversal of 6436699840 is 489966346.

It is a super-2 number, since 2×6436699840² = 82862209660512051200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6436699847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10057024 + ... + 10057663.

Almost surely, 2^6436699840 is an apocalyptic number.

It is an amenable number.

6436699840 is an abundant number, since it is smaller than the sum of its proper divisors (8890692416).

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

6436699840 is a wasteful number, since it uses less digits than its factorization.

6436699840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20114704 (or 20114694 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 55.

The square root of 6436699840 is about 80229.0461117418. The cubic root of 6436699840 is about 1860.1776374838.

The spelling of 6436699840 in words is "six billion, four hundred thirty-six million, six hundred ninety-nine thousand, eight hundred forty".