28031760 has 60 divisors (see below), whose sum is σ = 94142412. Its totient is φ = 7474944.

The previous prime is 28031749. The next prime is 28031771. The reversal of 28031760 is 6713082.

It is an interprime number because it is at equal distance from previous prime (28031749) and next prime (28031771).

It can be written as a sum of positive squares in 2 ways, for example, as 3111696 + 24920064 = 1764^2 + 4992^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18747 + ... + 20186.

Almost surely, 2^28031760 is an apocalyptic number.

28031760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28031760 is an abundant number, since it is smaller than the sum of its proper divisors (66110652).

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

28031760 is a wasteful number, since it uses less digits than its factorization.

28031760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38952 (or 38943 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 28031760 is about 5294.5028095186. The cubic root of 28031760 is about 303.7736657881.

The spelling of 28031760 in words is "twenty-eight million, thirty-one thousand, seven hundred sixty".