28640967 has 8 divisors (see below), whose sum is σ = 39076224. Its totient is φ = 18649848.

The previous prime is 28640947. The next prime is 28640977. The reversal of 28640967 is 76904682.

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

It is not a de Polignac number, because 28640967 - 2⁷ = 28640839 is a prime.

It is a super-3 number, since 3×28640967³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28640917) 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 7 ways as a sum of consecutive naturals, for example, 110883 + ... + 111140.

It is an arithmetic number, because the mean of its divisors is an integer number (4884528).

Almost surely, 2^28640967 is an apocalyptic number.

28640967 is a deficient number, since it is larger than the sum of its proper divisors (10435257).

28640967 is a wasteful number, since it uses less digits than its factorization.

28640967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222069.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 28640967 is about 5351.7256095581. The cubic root of 28640967 is about 305.9585252858.

The spelling of 28640967 in words is "twenty-eight million, six hundred forty thousand, nine hundred sixty-seven".