28776091 has 8 divisors (see below), whose sum is σ = 30729600. Its totient is φ = 26886720.

The previous prime is 28776043. The next prime is 28776101. The reversal of 28776091 is 19067782.

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

It is a cyclic number.

It is not a de Polignac number, because 28776091 - 2¹¹ = 28774043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28776001) 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, 15106 + ... + 16903.

It is an arithmetic number, because the mean of its divisors is an integer number (3841200).

Almost surely, 2^28776091 is an apocalyptic number.

28776091 is a deficient number, since it is larger than the sum of its proper divisors (1953509).

28776091 is a wasteful number, since it uses less digits than its factorization.

28776091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32069.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 28776091 is about 5364.3350939329. The cubic root of 28776091 is about 306.4389268249.

The spelling of 28776091 in words is "twenty-eight million, seven hundred seventy-six thousand, ninety-one".