28776951 has 20 divisors (see below), whose sum is σ = 49129872. Its totient is φ = 16443648.

The previous prime is 28776931. The next prime is 28776967. The reversal of 28776951 is 15967782.

It is not a de Polignac number, because 28776951 - 2¹⁰ = 28775927 is a prime.

It is a super-2 number, since 2×28776951² = 1656225817712802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28776897 and 28776906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28776911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24810 + ... + 25943.

Almost surely, 2^28776951 is an apocalyptic number.

28776951 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28776951 is a deficient number, since it is larger than the sum of its proper divisors (20352921).

28776951 is an equidigital number, since it uses as much as digits as its factorization.

28776951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50772 (or 50763 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 28776951 is about 5364.4152523831. The cubic root of 28776951 is about 306.4419795311.

The spelling of 28776951 in words is "twenty-eight million, seven hundred seventy-six thousand, nine hundred fifty-one".