23687028 has 18 divisors (see below), whose sum is σ = 59875634. Its totient is φ = 7895664.

The previous prime is 23687021. The next prime is 23687047. The reversal of 23687028 is 82078632.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23444964 + 242064 = 4842^2 + 492^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×23687028² = 1122150590945568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 657973 = 23687028 / (2 + 3 + 6 + 8 + 7 + 0 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 23686983 and 23687001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23687021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 328951 + ... + 329022.

Almost surely, 2^23687028 is an apocalyptic number.

It is an amenable number.

23687028 is an abundant number, since it is smaller than the sum of its proper divisors (36188606).

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

23687028 is a wasteful number, since it uses less digits than its factorization.

23687028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657983 (or 657978 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 23687028 is about 4866.9320932185. The cubic root of 23687028 is about 287.1905802783.

The spelling of 23687028 in words is "twenty-three million, six hundred eighty-seven thousand, twenty-eight".