28645977 has 16 divisors (see below), whose sum is σ = 40320000. Its totient is φ = 18040464.

The previous prime is 28645937. The next prime is 28645979. The reversal of 28645977 is 77954682.

It is not a de Polignac number, because 28645977 - 2⁶ = 28645913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28645979) 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 15 ways as a sum of consecutive naturals, for example, 33724 + ... + 34562.

It is an arithmetic number, because the mean of its divisors is an integer number (2520000).

Almost surely, 2^28645977 is an apocalyptic number.

It is an amenable number.

28645977 is a deficient number, since it is larger than the sum of its proper divisors (11674023).

28645977 is a wasteful number, since it uses less digits than its factorization.

28645977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460.

The product of its digits is 846720, while the sum is 48.

The square root of 28645977 is about 5352.1936624154. The cubic root of 28645977 is about 305.9763641020.

The spelling of 28645977 in words is "twenty-eight million, six hundred forty-five thousand, nine hundred seventy-seven".