22785399540 has 144 divisors (see below), whose sum is σ = 74381645520. Its totient is φ = 5624893440.

The previous prime is 22785399517. The next prime is 22785399551. The reversal of 22785399540 is 4599358722.

22785399540 is a `hidden beast` number, since 2 + 2 + 7 + 8 + 5 + 3 + 99 + 540 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 6247953936 + 16537445604 = 79044^2 + 128598^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125626 + ... + 247694.

It is an arithmetic number, because the mean of its divisors is an integer number (516539205).

Almost surely, 2^22785399540 is an apocalyptic number.

22785399540 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 22785399540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37190822760).

22785399540 is an abundant number, since it is smaller than the sum of its proper divisors (51596245980).

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

22785399540 is a wasteful number, since it uses less digits than its factorization.

22785399540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122162 (or 122157 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 22785399540 in words is "twenty-two billion, seven hundred eighty-five million, three hundred ninety-nine thousand, five hundred forty".