26158990 has 48 divisors (see below), whose sum is σ = 55770624. Its totient is φ = 8775360.

The previous prime is 26158987. The next prime is 26158999. The reversal of 26158990 is 9985162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26158999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14899 + ... + 16561.

It is an arithmetic number, because the mean of its divisors is an integer number (1161888).

Almost surely, 2^26158990 is an apocalyptic number.

26158990 is an abundant number, since it is smaller than the sum of its proper divisors (29611634).

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

26158990 is a wasteful number, since it uses less digits than its factorization.

26158990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705 (or 1694 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 26158990 is about 5114.5860047515. The cubic root of 26158990 is about 296.8522355952.

Subtracting from 26158990 its reverse (9985162), we obtain a triangular number (16173828 = T₅₆₈₇).

The spelling of 26158990 in words is "twenty-six million, one hundred fifty-eight thousand, nine hundred ninety".