22897890 has 72 divisors (see below), whose sum is σ = 61998300. Its totient is φ = 6088608.

The previous prime is 22897879. The next prime is 22897891. The reversal of 22897890 is 9879822.

It can be written as a sum of positive squares in 2 ways, for example, as 22838841 + 59049 = 4779^2 + 243^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (22897891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65436 + ... + 65784.

Almost surely, 2^22897890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22897890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30999150).

22897890 is an abundant number, since it is smaller than the sum of its proper divisors (39100410).

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

22897890 is an frugal number, since it uses more digits than its factorization.

22897890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 22897890 is about 4785.1739780284. The cubic root of 22897890 is about 283.9652225483.

The spelling of 22897890 in words is "twenty-two million, eight hundred ninety-seven thousand, eight hundred ninety".