23345640 has 48 divisors (see below), whose sum is σ = 75874500. Its totient is φ = 6225408.

The previous prime is 23345639. The next prime is 23345653. The reversal of 23345640 is 4654332.

It can be written as a sum of positive squares in 2 ways, for example, as 23097636 + 248004 = 4806^2 + 498^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32065 + ... + 32784.

Almost surely, 2^23345640 is an apocalyptic number.

23345640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23345640 is an abundant number, since it is smaller than the sum of its proper divisors (52528860).

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

23345640 is a wasteful number, since it uses less digits than its factorization.

23345640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64866 (or 64859 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 23345640 is about 4831.7326084956. The cubic root of 23345640 is about 285.8041921821.

Adding to 23345640 its reverse (4654332), we get a palindrome (27999972).

The spelling of 23345640 in words is "twenty-three million, three hundred forty-five thousand, six hundred forty".