26651664 has 120 divisors (see below), whose sum is σ = 83952960. Its totient is φ = 7831296.

The previous prime is 26651629. The next prime is 26651683. The reversal of 26651664 is 46615662.

It is a happy number.

It is a super-2 number, since 2×26651664² = 1420622387937792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42747 + ... + 43365.

It is an arithmetic number, because the mean of its divisors is an integer number (699608).

Almost surely, 2^26651664 is an apocalyptic number.

26651664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26651664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41976480).

26651664 is an abundant number, since it is smaller than the sum of its proper divisors (57301296).

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

26651664 is a wasteful number, since it uses less digits than its factorization.

26651664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 660 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 26651664 is about 5162.5249636200. The cubic root of 26651664 is about 298.7042784088.

The spelling of 26651664 in words is "twenty-six million, six hundred fifty-one thousand, six hundred sixty-four".