28700073 has 18 divisors (see below), whose sum is σ = 42195582. Its totient is φ = 18797760.

The previous prime is 28699997. The next prime is 28700081. The reversal of 28700073 is 37000782.

It can be written as a sum of positive squares in 3 ways, for example, as 56169 + 28643904 = 237^2 + 5352^2 .

It is not a de Polignac number, because 28700073 - 2¹² = 28695977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28701073) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 33061 + ... + 33917.

It is an arithmetic number, because the mean of its divisors is an integer number (2344199).

Almost surely, 2^28700073 is an apocalyptic number.

It is an amenable number.

28700073 is a deficient number, since it is larger than the sum of its proper divisors (13495509).

28700073 is an equidigital number, since it uses as much as digits as its factorization.

28700073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 28700073 is about 5357.2449075994. The cubic root of 28700073 is about 306.1688482466.

The spelling of 28700073 in words is "twenty-eight million, seven hundred thousand, seventy-three".