26776640 has 56 divisors (see below), whose sum is σ = 69567552. Its totient is φ = 9735680.

The previous prime is 26776609. The next prime is 26776663. The reversal of 26776640 is 4667762.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 26776594 and 26776603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284 + ... + 7323.

Almost surely, 2^26776640 is an apocalyptic number.

26776640 is a gapful number since it is divisible by the number (20) 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 26776640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34783776).

26776640 is an abundant number, since it is smaller than the sum of its proper divisors (42790912).

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

26776640 is a wasteful number, since it uses less digits than its factorization.

26776640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7635 (or 7625 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 26776640 is about 5174.6149615213. The cubic root of 26776640 is about 299.1704490055.

The spelling of 26776640 in words is "twenty-six million, seven hundred seventy-six thousand, six hundred forty".