23187780 has 216 divisors, whose sum is σ = 89631360. Its totient is φ = 4798080.

The previous prime is 23187761. The next prime is 23187781. The reversal of 23187780 is 8778132.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (23187781) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 96901 + ... + 97139.

It is an arithmetic number, because the mean of its divisors is an integer number (414960).

Almost surely, 2^23187780 is an apocalyptic number.

23187780 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 23187780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44815680).

23187780 is an abundant number, since it is smaller than the sum of its proper divisors (66443580).

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

23187780 is a wasteful number, since it uses less digits than its factorization.

23187780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 23187780 is about 4815.3691447282. The cubic root of 23187780 is about 285.1585452108.

The spelling of 23187780 in words is "twenty-three million, one hundred eighty-seven thousand, seven hundred eighty".