26635581940 has 96 divisors (see below), whose sum is σ = 65226228480. Its totient is φ = 9038515200.

The previous prime is 26635581901. The next prime is 26635581971. The reversal of 26635581940 is 4918553662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143266 + ... + 271654.

It is an arithmetic number, because the mean of its divisors is an integer number (679439880).

Almost surely, 2^26635581940 is an apocalyptic number.

26635581940 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 26635581940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32613114240).

26635581940 is an abundant number, since it is smaller than the sum of its proper divisors (38590646540).

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

26635581940 is a wasteful number, since it uses less digits than its factorization.

26635581940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128473 (or 128471 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 26635581940 in words is "twenty-six billion, six hundred thirty-five million, five hundred eighty-one thousand, nine hundred forty".