26690522220 has 144 divisors (see below), whose sum is σ = 84034772640. Its totient is φ = 7111120896.

The previous prime is 26690522207. The next prime is 26690522237. The reversal of 26690522220 is 2222509662.

26690522220 is a `hidden beast` number, since 26 + 6 + 90 + 522 + 2 + 20 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8420796 + ... + 8423964.

It is an arithmetic number, because the mean of its divisors is an integer number (583574810).

Almost surely, 2^26690522220 is an apocalyptic number.

26690522220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26690522220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42017386320).

26690522220 is an abundant number, since it is smaller than the sum of its proper divisors (57344250420).

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

26690522220 is a wasteful number, since it uses less digits than its factorization.

26690522220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4926 (or 4912 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 26690522220 in words is "twenty-six billion, six hundred ninety million, five hundred twenty-two thousand, two hundred twenty".