26431266728 has 8 divisors (see below), whose sum is σ = 49558625130. Its totient is φ = 13215633360.

The previous prime is 26431266721. The next prime is 26431266733. The reversal of 26431266728 is 82766213462.

It can be written as a sum of positive squares in only one way, i.e., 13339788004 + 13091478724 = 115498^2 + 114418^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×26431266728² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26431266721) 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 as a sum of consecutive naturals, namely, 1651954163 + ... + 1651954178.

Almost surely, 2^26431266728 is an apocalyptic number.

It is an amenable number.

26431266728 is a deficient number, since it is larger than the sum of its proper divisors (23127358402).

26431266728 is a wasteful number, since it uses less digits than its factorization.

26431266728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303908347 (or 3303908343 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 47.

The spelling of 26431266728 in words is "twenty-six billion, four hundred thirty-one million, two hundred sixty-six thousand, seven hundred twenty-eight".