28678951 has 8 divisors (see below), whose sum is σ = 32840864. Its totient is φ = 24533280.

The previous prime is 28678939. The next prime is 28678963. The reversal of 28678951 is 15987682.

28678951 is a nontrivial binomial coefficient, being equal to C(7574, 2).

It is an interprime number because it is at equal distance from previous prime (28678939) and next prime (28678963).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(28678951) divides (28678951-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 28678951 - 2⁵ = 28678919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28678901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 7573.

It is an arithmetic number, because the mean of its divisors is an integer number (4105108).

Almost surely, 2^28678951 is an apocalyptic number.

28678951 is the 7573-rd triangular number and also the 3787-th hexagonal number.

28678951 is the 2525-th centered nonagonal number.

28678951 is a deficient number, since it is larger than the sum of its proper divisors (4161913).

28678951 is an equidigital number, since it uses as much as digits as its factorization.

28678951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8121.

The product of its digits is 241920, while the sum is 46.

The square root of 28678951 is about 5355.2731956456. The cubic root of 28678951 is about 306.0937208475.

The spelling of 28678951 in words is "twenty-eight million, six hundred seventy-eight thousand, nine hundred fifty-one".