26890621 has 2 divisors, whose sum is σ = 26890622. Its totient is φ = 26890620.

The previous prime is 26890613. The next prime is 26890637. The reversal of 26890621 is 12609862.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25613721 + 1276900 = 5061^2 + 1130^2 .

It is a cyclic number.

It is not a de Polignac number, because 26890621 - 2³ = 26890613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26890021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13445310 + 13445311.

It is an arithmetic number, because the mean of its divisors is an integer number (13445311).

Almost surely, 2^26890621 is an apocalyptic number.

It is an amenable number.

26890621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26890621 is an equidigital number, since it uses as much as digits as its factorization.

26890621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 26890621 is about 5185.6167424907. The cubic root of 26890621 is about 299.5943443181.

The spelling of 26890621 in words is "twenty-six million, eight hundred ninety thousand, six hundred twenty-one".