26834043690 has 40 divisors (see below), whose sum is σ = 72153764100. Its totient is φ = 7155744768.

The previous prime is 26834043689. The next prime is 26834043727. The reversal of 26834043690 is 9634043862.

26834043690 is a `hidden beast` number, since 268 + 340 + 43 + 6 + 9 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26598021921 + 236021769 = 163089^2 + 15363^2 .

It is a super-2 number, since 2×26834043690² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16563415 + ... + 16565034.

Almost surely, 2^26834043690 is an apocalyptic number.

26834043690 is an abundant number, since it is smaller than the sum of its proper divisors (45319720410).

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

26834043690 is a wasteful number, since it uses less digits than its factorization.

26834043690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33128468 (or 33128459 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The spelling of 26834043690 in words is "twenty-six billion, eight hundred thirty-four million, forty-three thousand, six hundred ninety".