28005967 has 8 divisors (see below), whose sum is σ = 31605840. Its totient is φ = 24581760.

The previous prime is 28005941. The next prime is 28005979. The reversal of 28005967 is 76950082.

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 28005967 - 2⁷ = 28005839 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 (28005907) 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, 43578 + ... + 44215.

It is an arithmetic number, because the mean of its divisors is an integer number (3950730).

Almost surely, 2^28005967 is an apocalyptic number.

28005967 is a deficient number, since it is larger than the sum of its proper divisors (3599873).

28005967 is a wasteful number, since it uses less digits than its factorization.

28005967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87833.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 28005967 is about 5292.0664205960. The cubic root of 28005967 is about 303.6804662821.

It can be divided in two parts, 280059 and 67, that added together give a triangular number (280126 = T₇₄₈).

The spelling of 28005967 in words is "twenty-eight million, five thousand, nine hundred sixty-seven".