26690989 has 8 divisors (see below), whose sum is σ = 28784952. Its totient is φ = 24602880.

The previous prime is 26690981. The next prime is 26690999. The reversal of 26690989 is 98909662.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2778889 + 23912100 = 1667^2 + 4890^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26690989 - 2³ = 26690981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26690981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14649 + ... + 16369.

It is an arithmetic number, because the mean of its divisors is an integer number (3598119).

Almost surely, 2^26690989 is an apocalyptic number.

It is an amenable number.

26690989 is a deficient number, since it is larger than the sum of its proper divisors (2093963).

26690989 is a wasteful number, since it uses less digits than its factorization.

26690989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2927.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 26690989 is about 5166.3322579950. The cubic root of 26690989 is about 298.8511206856.

The spelling of 26690989 in words is "twenty-six million, six hundred ninety thousand, nine hundred eighty-nine".