28617867 has 48 divisors (see below), whose sum is σ = 46126080. Its totient is φ = 17690400.

The previous prime is 28617863. The next prime is 28617881. The reversal of 28617867 is 76871682.

28617867 is a `hidden beast` number, since 28 + 617 + 8 + 6 + 7 = 666.

It is not a de Polignac number, because 28617867 - 2² = 28617863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28617863) 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 47 ways as a sum of consecutive naturals, for example, 218392 + ... + 218522.

It is an arithmetic number, because the mean of its divisors is an integer number (960960).

Almost surely, 2^28617867 is an apocalyptic number.

28617867 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28617867 is a deficient number, since it is larger than the sum of its proper divisors (17508213).

28617867 is a wasteful number, since it uses less digits than its factorization.

28617867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 194 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 28617867 is about 5349.5669918228. The cubic root of 28617867 is about 305.8762475367.

The spelling of 28617867 in words is "twenty-eight million, six hundred seventeen thousand, eight hundred sixty-seven".