26431664 has 20 divisors (see below), whose sum is σ = 58527504. Its totient is φ = 11327808.

The previous prime is 26431661. The next prime is 26431681. The reversal of 26431664 is 46613462.

It is a self number, because there is not a number n which added to its sum of digits gives 26431664.

It is not an unprimeable number, because it can be changed into a prime (26431661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117887 + ... + 118110.

Almost surely, 2^26431664 is an apocalyptic number.

It is an amenable number.

26431664 is an abundant number, since it is smaller than the sum of its proper divisors (32095840).

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

26431664 is a wasteful number, since it uses less digits than its factorization.

26431664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236012 (or 236006 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The square root of 26431664 is about 5141.1734069179. The cubic root of 26431664 is about 297.8801073193.

The spelling of 26431664 in words is "twenty-six million, four hundred thirty-one thousand, six hundred sixty-four".