26508981990 has 16 divisors (see below), whose sum is σ = 63621556848. Its totient is φ = 7069061856.

The previous prime is 26508981937. The next prime is 26508981991. The reversal of 26508981990 is 9918980562.

It is a super-2 number, since 2×26508981990² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26508981990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26508981991) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 441816337 + ... + 441816396.

It is an arithmetic number, because the mean of its divisors is an integer number (3976347303).

Almost surely, 2^26508981990 is an apocalyptic number.

26508981990 is an abundant number, since it is smaller than the sum of its proper divisors (37112574858).

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

26508981990 is a wasteful number, since it uses less digits than its factorization.

26508981990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883632743.

The product of its (nonzero) digits is 2799360, while the sum is 57.

The spelling of 26508981990 in words is "twenty-six billion, five hundred eight million, nine hundred eighty-one thousand, nine hundred ninety".