23667640 has 16 divisors (see below), whose sum is σ = 53252280. Its totient is φ = 9467040.

The previous prime is 23667629. The next prime is 23667641. The reversal of 23667640 is 4676632.

It is a junction number, because it is equal to n+sod(n) for n = 23667596 and 23667605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23667641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295806 + ... + 295885.

Almost surely, 2^23667640 is an apocalyptic number.

23667640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23667640 is an abundant number, since it is smaller than the sum of its proper divisors (29584640).

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

23667640 is a wasteful number, since it uses less digits than its factorization.

23667640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591702 (or 591698 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 23667640 is about 4864.9398762986. The cubic root of 23667640 is about 287.1122030497.

It can be divided in two parts, 236 and 67640, that added together give a palindrome (67876).

The spelling of 23667640 in words is "twenty-three million, six hundred sixty-seven thousand, six hundred forty".