26436634644 has 36 divisors (see below), whose sum is σ = 71756581344. Its totient is φ = 7553324016.

The previous prime is 26436634591. The next prime is 26436634673. The reversal of 26436634644 is 44643663462.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 26436634593 and 26436634602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22479544 + ... + 22480719.

Almost surely, 2^26436634644 is an apocalyptic number.

It is an amenable number.

26436634644 is an abundant number, since it is smaller than the sum of its proper divisors (45319946700).

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

26436634644 is a wasteful number, since it uses less digits than its factorization.

26436634644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44960284 (or 44960275 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 48.

The spelling of 26436634644 in words is "twenty-six billion, four hundred thirty-six million, six hundred thirty-four thousand, six hundred forty-four".