23787640 has 32 divisors (see below), whose sum is σ = 54665280. Its totient is φ = 9311872.

The previous prime is 23787637. The next prime is 23787649. The reversal of 23787640 is 4678732.

It is a self number, because there is not a number n which added to its sum of digits gives 23787640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23787649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4447 + ... + 8206.

It is an arithmetic number, because the mean of its divisors is an integer number (1708290).

Almost surely, 2^23787640 is an apocalyptic number.

23787640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23787640 is an abundant number, since it is smaller than the sum of its proper divisors (30877640).

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

23787640 is a wasteful number, since it uses less digits than its factorization.

23787640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12711 (or 12707 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 23787640 is about 4877.2574260541. The cubic root of 23787640 is about 287.5966253667.

The spelling of 23787640 in words is "twenty-three million, seven hundred eighty-seven thousand, six hundred forty".