28762291 has 2 divisors, whose sum is σ = 28762292. Its totient is φ = 28762290.

The previous prime is 28762277. The next prime is 28762309. The reversal of 28762291 is 19226782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28762291 - 2⁷ = 28762163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28762291.

It is not a weakly prime, because it can be changed into another prime (28762231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14381145 + 14381146.

It is an arithmetic number, because the mean of its divisors is an integer number (14381146).

Almost surely, 2^28762291 is an apocalyptic number.

28762291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28762291 is an equidigital number, since it uses as much as digits as its factorization.

28762291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 28762291 is about 5363.0486665702. The cubic root of 28762291 is about 306.3899332192.

The spelling of 28762291 in words is "twenty-eight million, seven hundred sixty-two thousand, two hundred ninety-one".