26638420 has 12 divisors (see below), whose sum is σ = 55940724. Its totient is φ = 10655360.

The previous prime is 26638387. The next prime is 26638421. The reversal of 26638420 is 2483662.

It can be written as a sum of positive squares in 2 ways, for example, as 3732624 + 22905796 = 1932^2 + 4786^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26638421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665941 + ... + 665980.

It is an arithmetic number, because the mean of its divisors is an integer number (4661727).

Almost surely, 2^26638420 is an apocalyptic number.

26638420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26638420 is an abundant number, since it is smaller than the sum of its proper divisors (29302304).

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

26638420 is a wasteful number, since it uses less digits than its factorization.

26638420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331930 (or 1331928 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 26638420 is about 5161.2420985650. The cubic root of 26638420 is about 298.6547918810.

The spelling of 26638420 in words is "twenty-six million, six hundred thirty-eight thousand, four hundred twenty".