28157651 has 4 divisors (see below), whose sum is σ = 28257432. Its totient is φ = 28057872.

The previous prime is 28157609. The next prime is 28157659. The reversal of 28157651 is 15675182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28157651 - 2⁶ = 28157587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28157659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49466 + ... + 50031.

It is an arithmetic number, because the mean of its divisors is an integer number (7064358).

Almost surely, 2^28157651 is an apocalyptic number.

28157651 is a deficient number, since it is larger than the sum of its proper divisors (99781).

28157651 is an equidigital number, since it uses as much as digits as its factorization.

28157651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99780.

The product of its digits is 16800, while the sum is 35.

The square root of 28157651 is about 5306.3783317815. The cubic root of 28157651 is about 304.2277372172.

The spelling of 28157651 in words is "twenty-eight million, one hundred fifty-seven thousand, six hundred fifty-one".