28507273 has 2 divisors, whose sum is σ = 28507274. Its totient is φ = 28507272.

The previous prime is 28507267. The next prime is 28507291. The reversal of 28507273 is 37270582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23503104 + 5004169 = 4848^2 + 2237^2 .

It is a cyclic number.

It is not a de Polignac number, because 28507273 - 2²¹ = 26410121 is a prime.

It is a super-2 number, since 2×28507273² = 1625329227793058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28507253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14253636 + 14253637.

It is an arithmetic number, because the mean of its divisors is an integer number (14253637).

Almost surely, 2^28507273 is an apocalyptic number.

It is an amenable number.

28507273 is a deficient number, since it is larger than the sum of its proper divisors (1).

28507273 is an equidigital number, since it uses as much as digits as its factorization.

28507273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 28507273 is about 5339.2202614239. The cubic root of 28507273 is about 305.4817183914.

The spelling of 28507273 in words is "twenty-eight million, five hundred seven thousand, two hundred seventy-three".