26172990 has 128 divisors (see below), whose sum is σ = 74649600. Its totient is φ = 6514560.

The previous prime is 26172983. The next prime is 26173009. The reversal of 26172990 is 9927162.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 443581 + ... + 443639.

It is an arithmetic number, because the mean of its divisors is an integer number (583200).

Almost surely, 2^26172990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26172990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37324800).

26172990 is an abundant number, since it is smaller than the sum of its proper divisors (48476610).

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

26172990 is a wasteful number, since it uses less digits than its factorization.

26172990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 26172990 is about 5115.9544564040. The cubic root of 26172990 is about 296.9051834870.

The spelling of 26172990 in words is "twenty-six million, one hundred seventy-two thousand, nine hundred ninety".