22891806 has 48 divisors (see below), whose sum is σ = 57299424. Its totient is φ = 6469632.

The previous prime is 22891769. The next prime is 22891807. The reversal of 22891806 is 60819822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22891807) 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, 11286 + ... + 13158.

It is an arithmetic number, because the mean of its divisors is an integer number (1193738).

Almost surely, 2^22891806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22891806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28649712).

22891806 is an abundant number, since it is smaller than the sum of its proper divisors (34407618).

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

22891806 is a wasteful number, since it uses less digits than its factorization.

22891806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985 (or 1982 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 22891806 is about 4784.5382222321. The cubic root of 22891806 is about 283.9400703407.

It can be divided in two parts, 2289 and 1806, that added together give a triangular number (4095 = T₉₀).

The spelling of 22891806 in words is "twenty-two million, eight hundred ninety-one thousand, eight hundred six".