23487394640 has 80 divisors (see below), whose sum is σ = 57805228800. Its totient is φ = 8860002816.

The previous prime is 23487394589. The next prime is 23487394649. The reversal of 23487394640 is 4649378432.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23487394649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17960 + ... + 217479.

It is an arithmetic number, because the mean of its divisors is an integer number (722565360).

Almost surely, 2^23487394640 is an apocalyptic number.

23487394640 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 23487394640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28902614400).

23487394640 is an abundant number, since it is smaller than the sum of its proper divisors (34317834160).

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

23487394640 is a wasteful number, since it uses less digits than its factorization.

23487394640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235524 (or 235518 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 50.

The spelling of 23487394640 in words is "twenty-three billion, four hundred eighty-seven million, three hundred ninety-four thousand, six hundred forty".