26778664 has 16 divisors (see below), whose sum is σ = 54774720. Its totient is φ = 12172080.

The previous prime is 26778659. The next prime is 26778667. The reversal of 26778664 is 46687762.

It is not an unprimeable number, because it can be changed into a prime (26778667) 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, 152064 + ... + 152239.

It is an arithmetic number, because the mean of its divisors is an integer number (3423420).

Almost surely, 2^26778664 is an apocalyptic number.

It is an amenable number.

26778664 is an abundant number, since it is smaller than the sum of its proper divisors (27996056).

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

26778664 is a wasteful number, since it uses less digits than its factorization.

26778664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304320 (or 304316 counting only the distinct ones).

The product of its digits is 677376, while the sum is 46.

The square root of 26778664 is about 5174.8105279324. The cubic root of 26778664 is about 299.1779867416.

The spelling of 26778664 in words is "twenty-six million, seven hundred seventy-eight thousand, six hundred sixty-four".