23515438644 has 96 divisors (see below), whose sum is σ = 62512490880. Its totient is φ = 7640006400.

The previous prime is 23515438633. The next prime is 23515438657. The reversal of 23515438644 is 44683451532.

23515438644 is a `hidden beast` number, since 23 + 5 + 1 + 543 + 86 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 23515438644.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6564934 + ... + 6568514.

It is an arithmetic number, because the mean of its divisors is an integer number (651171780).

Almost surely, 2^23515438644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23515438644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31256245440).

23515438644 is an abundant number, since it is smaller than the sum of its proper divisors (38997052236).

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

23515438644 is a wasteful number, since it uses less digits than its factorization.

23515438644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5118 (or 5110 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 45.

The spelling of 23515438644 in words is "twenty-three billion, five hundred fifteen million, four hundred thirty-eight thousand, six hundred forty-four".