22312500 has 168 divisors, whose sum is σ = 78748992. Its totient is φ = 4800000.

The previous prime is 22312489. The next prime is 22312501. The reversal of 22312500 is 521322.

It is a super-3 number, since 3×22312500³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 22312500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22312501) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1312492 + ... + 1312508.

It is an arithmetic number, because the mean of its divisors is an integer number (468744).

Almost surely, 2^22312500 is an apocalyptic number.

22312500 is a gapful number since it is divisible by the number (20) 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 22312500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39374496).

22312500 is an abundant number, since it is smaller than the sum of its proper divisors (56436492).

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

22312500 is an equidigital number, since it uses as much as digits as its factorization.

22312500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 22312500 is about 4723.6109069228. The cubic root of 22312500 is about 281.5244235082.

Adding to 22312500 its reverse (521322), we get a palindrome (22833822).

The spelling of 22312500 in words is "twenty-two million, three hundred twelve thousand, five hundred".