6900531638 has 32 divisors (see below), whose sum is σ = 13897578240.
Its totient is φ = 2481708960.
The previous prime is 6900531637. The next prime is 6900531641. The reversal of 6900531638 is 8361350096.
It is a junction number, because it is equal to n+sod(n) for n = 6900531595 and 6900531604.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (6900531637) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1721408 + ... + 1725411.
It is an arithmetic number, because the mean of its divisors is an integer number (434299320).
Almost surely, 26900531638 is an apocalyptic number.
6900531638 is an abundant number, since it is smaller than the sum of its proper divisors (6997046602).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
6900531638 is a wasteful number, since it uses less digits than its factorization.
6900531638 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3446852.
The product of its (nonzero) digits is 116640, while the sum is 41.
The square root of 6900531638 is about 83069.4386522504.
The cubic root of 6900531638 is about 1903.8271554355.
The spelling of 6900531638 in words is "six billion, nine hundred million, five hundred thirty-one thousand, six hundred thirty-eight".