26721661028 has 24 divisors (see below), whose sum is σ = 49229500320. Its totient is φ = 12656243520.

The previous prime is 26721660941. The next prime is 26721661063. The reversal of 26721661028 is 82016612762.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1122368 + ... + 1145928.

It is an arithmetic number, because the mean of its divisors is an integer number (2051229180).

Almost surely, 2^26721661028 is an apocalyptic number.

It is an amenable number.

26721661028 is a deficient number, since it is larger than the sum of its proper divisors (22507839292).

26721661028 is a wasteful number, since it uses less digits than its factorization.

26721661028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38507 (or 38505 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 26721661028 in words is "twenty-six billion, seven hundred twenty-one million, six hundred sixty-one thousand, twenty-eight".