23281787540 has 96 divisors (see below), whose sum is σ = 55233480960. Its totient is φ = 8165606400.

The previous prime is 23281787533. The next prime is 23281787561. The reversal of 23281787540 is 4578718232.

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 31 ways as a sum of consecutive naturals, for example, 11680784 + ... + 11682776.

It is an arithmetic number, because the mean of its divisors is an integer number (575348760).

Almost surely, 2^23281787540 is an apocalyptic number.

23281787540 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 23281787540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27616740480).

23281787540 is an abundant number, since it is smaller than the sum of its proper divisors (31951693420).

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

23281787540 is a wasteful number, since it uses less digits than its factorization.

23281787540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3873 (or 3871 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 23281787540 in words is "twenty-three billion, two hundred eighty-one million, seven hundred eighty-seven thousand, five hundred forty".