28126651 has 4 divisors (see below), whose sum is σ = 32144752. Its totient is φ = 24108552.

The previous prime is 28126649. The next prime is 28126661. The reversal of 28126651 is 15662182.

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 28126651 - 2¹ = 28126649 is a prime.

It is a super-2 number, since 2×28126651² = 1582216992951602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28126661) 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, 2009040 + ... + 2009053.

It is an arithmetic number, because the mean of its divisors is an integer number (8036188).

Almost surely, 2^28126651 is an apocalyptic number.

28126651 is a deficient number, since it is larger than the sum of its proper divisors (4018101).

28126651 is an equidigital number, since it uses as much as digits as its factorization.

28126651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018100.

The product of its digits is 5760, while the sum is 31.

The square root of 28126651 is about 5303.4565143876. The cubic root of 28126651 is about 304.1160503085.

The spelling of 28126651 in words is "twenty-eight million, one hundred twenty-six thousand, six hundred fifty-one".