23271640 has 64 divisors (see below), whose sum is σ = 63374400. Its totient is φ = 7507968.

The previous prime is 23271629. The next prime is 23271671. The reversal of 23271640 is 4617232.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2316 + ... + 7204.

It is an arithmetic number, because the mean of its divisors is an integer number (990225).

Almost surely, 2^23271640 is an apocalyptic number.

23271640 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 23271640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31687200).

23271640 is an abundant number, since it is smaller than the sum of its proper divisors (40102760).

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

23271640 is a wasteful number, since it uses less digits than its factorization.

23271640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4924 (or 4920 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 23271640 is about 4824.0688220630. The cubic root of 23271640 is about 285.5018959657.

Adding to 23271640 its reverse (4617232), we get a palindrome (27888872).

The spelling of 23271640 in words is "twenty-three million, two hundred seventy-one thousand, six hundred forty".