26778220 has 48 divisors (see below), whose sum is σ = 67656960. Its totient is φ = 8697024.

The previous prime is 26778209. The next prime is 26778251. The reversal of 26778220 is 2287762.

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, 2374 + ... + 7693.

It is an arithmetic number, because the mean of its divisors is an integer number (1409520).

Almost surely, 2^26778220 is an apocalyptic number.

26778220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26778220 is an abundant number, since it is smaller than the sum of its proper divisors (40878740).

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

26778220 is a wasteful number, since it uses less digits than its factorization.

26778220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10102 (or 10100 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 26778220 is about 5174.7676276331. The cubic root of 26778220 is about 299.1763332391.

It can be divided in two parts, 267 and 78220, that added together give a palindrome (78487).

The spelling of 26778220 in words is "twenty-six million, seven hundred seventy-eight thousand, two hundred twenty".