28390760 has 16 divisors (see below), whose sum is σ = 63879300. Its totient is φ = 11356288.

The previous prime is 28390759. The next prime is 28390777. The reversal of 28390760 is 6709382.

It can be written as a sum of positive squares in 2 ways, for example, as 27394756 + 996004 = 5234^2 + 998^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28390760.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354845 + ... + 354924.

Almost surely, 2^28390760 is an apocalyptic number.

28390760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28390760 is an abundant number, since it is smaller than the sum of its proper divisors (35488540).

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

28390760 is a wasteful number, since it uses less digits than its factorization.

28390760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709780 (or 709776 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 28390760 is about 5328.2980397121. The cubic root of 28390760 is about 305.0649686915.

The spelling of 28390760 in words is "twenty-eight million, three hundred ninety thousand, seven hundred sixty".