22151808 has 192 divisors, whose sum is σ = 75741120. Its totient is φ = 6082560.

The previous prime is 22151803. The next prime is 22151813. The reversal of 22151808 is 80815122.

It is an interprime number because it is at equal distance from previous prime (22151803) and next prime (22151813).

It is a tau number, because it is divible by the number of its divisors (192).

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (22151803) 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, 330591 + ... + 330657.

It is an arithmetic number, because the mean of its divisors is an integer number (394485).

Almost surely, 2^22151808 is an apocalyptic number.

22151808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22151808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37870560).

22151808 is an abundant number, since it is smaller than the sum of its proper divisors (53589312).

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

22151808 is a wasteful number, since it uses less digits than its factorization.

22151808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 22151808 is about 4706.5707261232. The cubic root of 22151808 is about 280.8469592976.

The spelling of 22151808 in words is "twenty-two million, one hundred fifty-one thousand, eight hundred eight".