28001730 has 32 divisors (see below), whose sum is σ = 67376448. Its totient is φ = 7448000.

The previous prime is 28001713. The next prime is 28001731. The reversal of 28001730 is 3710082.

It is a super-3 number, since 3×28001730³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28001697 and 28001706.

It is not an unprimeable number, because it can be changed into a prime (28001731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13780 + ... + 15680.

It is an arithmetic number, because the mean of its divisors is an integer number (2105514).

Almost surely, 2^28001730 is an apocalyptic number.

28001730 is an abundant number, since it is smaller than the sum of its proper divisors (39374718).

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

28001730 is a wasteful number, since it uses less digits than its factorization.

28001730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 28001730 is about 5291.6660892388. Note that the first 3 decimals coincide. The cubic root of 28001730 is about 303.6651509861.

The spelling of 28001730 in words is "twenty-eight million, one thousand, seven hundred thirty".