28167880 has 64 divisors (see below), whose sum is σ = 71870400. Its totient is φ = 9849600.

The previous prime is 28167869. The next prime is 28167907. The reversal of 28167880 is 8876182.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8455 + ... + 11305.

It is an arithmetic number, because the mean of its divisors is an integer number (1122975).

Almost surely, 2^28167880 is an apocalyptic number.

28167880 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 28167880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35935200).

28167880 is an abundant number, since it is smaller than the sum of its proper divisors (43702520).

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

28167880 is a wasteful number, since it uses less digits than its factorization.

28167880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894 (or 2890 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 28167880 is about 5307.3420843205. The cubic root of 28167880 is about 304.2645723065.

The spelling of 28167880 in words is "twenty-eight million, one hundred sixty-seven thousand, eight hundred eighty".