23409587640 has 128 divisors (see below), whose sum is σ = 76474368000. Its totient is φ = 5710053888.

The previous prime is 23409587581. The next prime is 23409587647. The reversal of 23409587640 is 4678590432.

It is a self number, because there is not a number n which added to its sum of digits gives 23409587640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23409587647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110904 + ... + 243143.

It is an arithmetic number, because the mean of its divisors is an integer number (597456000).

Almost surely, 2^23409587640 is an apocalyptic number.

23409587640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23409587640 is an abundant number, since it is smaller than the sum of its proper divisors (53064780360).

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

23409587640 is a wasteful number, since it uses less digits than its factorization.

23409587640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354109 (or 354105 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 23409587640 in words is "twenty-three billion, four hundred nine million, five hundred eighty-seven thousand, six hundred forty".