26278820 has 24 divisors (see below), whose sum is σ = 55334328. Its totient is φ = 10483200.

The previous prime is 26278801. The next prime is 26278823. The reversal of 26278820 is 2887262.

26278820 is nontrivially palindromic in base 12.

It can be written as a sum of positive squares in 4 ways, for example, as 4301476 + 21977344 = 2074^2 + 4688^2 .

It is not an unprimeable number, because it can be changed into a prime (26278823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6860 + ... + 9980.

It is an arithmetic number, because the mean of its divisors is an integer number (2305597).

Almost surely, 2^26278820 is an apocalyptic number.

26278820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26278820 is an abundant number, since it is smaller than the sum of its proper divisors (29055508).

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

26278820 is a wasteful number, since it uses less digits than its factorization.

26278820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551 (or 3549 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 26278820 is about 5126.2871554372. The cubic root of 26278820 is about 297.3048221951.

The spelling of 26278820 in words is "twenty-six million, two hundred seventy-eight thousand, eight hundred twenty".