28578961 has 16 divisors (see below), whose sum is σ = 30412800. Its totient is φ = 26823888.

The previous prime is 28578959. The next prime is 28578967. The reversal of 28578961 is 16987582.

It is a cyclic number.

It is not a de Polignac number, because 28578961 - 2¹ = 28578959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28578967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159570 + ... + 159748.

It is an arithmetic number, because the mean of its divisors is an integer number (1900800).

Almost surely, 2^28578961 is an apocalyptic number.

It is an amenable number.

28578961 is a deficient number, since it is larger than the sum of its proper divisors (1833839).

28578961 is a wasteful number, since it uses less digits than its factorization.

28578961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348.

The product of its digits is 241920, while the sum is 46.

The square root of 28578961 is about 5345.9293859908. The cubic root of 28578961 is about 305.7375717199.

The spelling of 28578961 in words is "twenty-eight million, five hundred seventy-eight thousand, nine hundred sixty-one".