28145651 has 2 divisors, whose sum is σ = 28145652. Its totient is φ = 28145650.

The previous prime is 28145647. The next prime is 28145657. The reversal of 28145651 is 15654182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28145651 - 2² = 28145647 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28145657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14072825 + 14072826.

It is an arithmetic number, because the mean of its divisors is an integer number (14072826).

Almost surely, 2^28145651 is an apocalyptic number.

28145651 is a deficient number, since it is larger than the sum of its proper divisors (1).

28145651 is an equidigital number, since it uses as much as digits as its factorization.

28145651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 32.

The square root of 28145651 is about 5305.2474965830. The cubic root of 28145651 is about 304.1845133041.

The spelling of 28145651 in words is "twenty-eight million, one hundred forty-five thousand, six hundred fifty-one".