28645940 has 12 divisors (see below), whose sum is σ = 60156516. Its totient is φ = 11458368.

The previous prime is 28645937. The next prime is 28645979. The reversal of 28645940 is 4954682.

It can be written as a sum of positive squares in 2 ways, for example, as 13498276 + 15147664 = 3674^2 + 3892^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28645894 and 28645903.

It is a congruent number.

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, 716129 + ... + 716168.

It is an arithmetic number, because the mean of its divisors is an integer number (5013043).

Almost surely, 2^28645940 is an apocalyptic number.

28645940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28645940 is an abundant number, since it is smaller than the sum of its proper divisors (31510576).

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

28645940 is a wasteful number, since it uses less digits than its factorization.

28645940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432306 (or 1432304 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 28645940 is about 5352.1902058877. The cubic root of 28645940 is about 305.9762323659.

The spelling of 28645940 in words is "twenty-eight million, six hundred forty-five thousand, nine hundred forty".