28187760 has 80 divisors (see below), whose sum is σ = 87914016. Its totient is φ = 7471104.

The previous prime is 28187749. The next prime is 28187767. The reversal of 28187760 is 6778182.

28187760 = 923² + 924² + ... + 954².

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28187767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61452 + ... + 61908.

Almost surely, 2^28187760 is an apocalyptic number.

28187760 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 28187760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43957008).

28187760 is an abundant number, since it is smaller than the sum of its proper divisors (59726256).

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

28187760 is a wasteful number, since it uses less digits than its factorization.

28187760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 28187760 is about 5309.2146311860. The cubic root of 28187760 is about 304.3361355817.

The spelling of 28187760 in words is "twenty-eight million, one hundred eighty-seven thousand, seven hundred sixty".