28291760 has 80 divisors (see below), whose sum is σ = 79161600. Its totient is φ = 9186048.

The previous prime is 28291759. The next prime is 28291777. The reversal of 28291760 is 6719282.

It is a happy number.

It is a Cunningham number, because it is equal to 5319²-1.

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

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 28291760.

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, 9311 + ... + 11969.

It is an arithmetic number, because the mean of its divisors is an integer number (989520).

Almost surely, 2^28291760 is an apocalyptic number.

28291760 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 28291760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39580800).

28291760 is an abundant number, since it is smaller than the sum of its proper divisors (50869840).

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

28291760 is a wasteful number, since it uses less digits than its factorization.

28291760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698 (or 2692 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 28291760 is about 5318.9999059974. Note that the first 4 decimals coincide. The cubic root of 28291760 is about 304.7099634633.

The spelling of 28291760 in words is "twenty-eight million, two hundred ninety-one thousand, seven hundred sixty".