22531239780 has 144 divisors (see below), whose sum is σ = 74631896640. Its totient is φ = 5062670592.

The previous prime is 22531239769. The next prime is 22531239781. The reversal of 22531239780 is 8793213522.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (22531239781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108514 + ... + 238406.

It is an arithmetic number, because the mean of its divisors is an integer number (518277060).

Almost surely, 2^22531239780 is an apocalyptic number.

22531239780 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 22531239780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37315948320).

22531239780 is an abundant number, since it is smaller than the sum of its proper divisors (52100656860).

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

22531239780 is a wasteful number, since it uses less digits than its factorization.

22531239780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129978 (or 129969 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 22531239780 in words is "twenty-two billion, five hundred thirty-one million, two hundred thirty-nine thousand, seven hundred eighty".