26639943980 has 24 divisors (see below), whose sum is σ = 60247258512. Its totient is φ = 9836286912.

The previous prime is 26639943949. The next prime is 26639943989. The reversal of 26639943980 is 8934993662.

It is not an unprimeable number, because it can be changed into a prime (26639943989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51230402 + ... + 51230921.

It is an arithmetic number, because the mean of its divisors is an integer number (2510302438).

Almost surely, 2^26639943980 is an apocalyptic number.

26639943980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26639943980 is an abundant number, since it is smaller than the sum of its proper divisors (33607314532).

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

26639943980 is a wasteful number, since it uses less digits than its factorization.

26639943980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102461345 (or 102461343 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 59.

The spelling of 26639943980 in words is "twenty-six billion, six hundred thirty-nine million, nine hundred forty-three thousand, nine hundred eighty".