23257740 has 96 divisors (see below), whose sum is σ = 71850240. Its totient is φ = 5574400.

The previous prime is 23257723. The next prime is 23257753. The reversal of 23257740 is 4775232.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 23257698 and 23257707.

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 31 ways as a sum of consecutive naturals, for example, 86326 + ... + 86594.

It is an arithmetic number, because the mean of its divisors is an integer number (748440).

Almost surely, 2^23257740 is an apocalyptic number.

23257740 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 23257740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35925120).

23257740 is an abundant number, since it is smaller than the sum of its proper divisors (48592500).

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

23257740 is a wasteful number, since it uses less digits than its factorization.

23257740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 30.

The square root of 23257740 is about 4822.6279143222. The cubic root of 23257740 is about 285.4450418330.

The spelling of 23257740 in words is "twenty-three million, two hundred fifty-seven thousand, seven hundred forty".