26678664 has 24 divisors (see below), whose sum is σ = 72254910. Its totient is φ = 8892864.

The previous prime is 26678651. The next prime is 26678669. The reversal of 26678664 is 46687662.

It can be written as a sum of positive squares in only one way, i.e., 22638564 + 4040100 = 4758^2 + 2010^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×26678664² = 1423502225649792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26678669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 185197 + ... + 185340.

Almost surely, 2^26678664 is an apocalyptic number.

26678664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

26678664 is an abundant number, since it is smaller than the sum of its proper divisors (45576246).

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

26678664 is a wasteful number, since it uses less digits than its factorization.

26678664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370549 (or 370542 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 26678664 is about 5165.1393011225. The cubic root of 26678664 is about 298.8051138085.

The spelling of 26678664 in words is "twenty-six million, six hundred seventy-eight thousand, six hundred sixty-four".