26978864 has 80 divisors (see below), whose sum is σ = 61710336. Its totient is φ = 11289600.

The previous prime is 26978857. The next prime is 26978899. The reversal of 26978864 is 46887962.

26978864 = T₁₇ + T₁₈ + ... + T₅₄₄.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212369 + ... + 212495.

Almost surely, 2^26978864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26978864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30855168).

26978864 is an abundant number, since it is smaller than the sum of its proper divisors (34731472).

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

26978864 is a wasteful number, since it uses less digits than its factorization.

26978864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 228 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The square root of 26978864 is about 5194.1182119779. The cubic root of 26978864 is about 299.9216980830.

The spelling of 26978864 in words is "twenty-six million, nine hundred seventy-eight thousand, eight hundred sixty-four".