28920967 has 4 divisors (see below), whose sum is σ = 28950640. Its totient is φ = 28891296.

The previous prime is 28920953. The next prime is 28920977. The reversal of 28920967 is 76902982.

It is a happy number.

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 28920967 - 2¹⁵ = 28888199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28920977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13323 + ... + 15340.

It is an arithmetic number, because the mean of its divisors is an integer number (7237660).

Almost surely, 2^28920967 is an apocalyptic number.

28920967 is a deficient number, since it is larger than the sum of its proper divisors (29673).

28920967 is a wasteful number, since it uses less digits than its factorization.

28920967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29672.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 28920967 is about 5377.8217709403. The cubic root of 28920967 is about 306.9523316157.

The spelling of 28920967 in words is "twenty-eight million, nine hundred twenty thousand, nine hundred sixty-seven".