28961659 has 4 divisors (see below), whose sum is σ = 30665304. Its totient is φ = 27258016.

The previous prime is 28961617. The next prime is 28961683. The reversal of 28961659 is 95616982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28961659 - 2⁹ = 28961147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28961689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851797 + ... + 851830.

It is an arithmetic number, because the mean of its divisors is an integer number (7666326).

Almost surely, 2^28961659 is an apocalyptic number.

28961659 is a deficient number, since it is larger than the sum of its proper divisors (1703645).

28961659 is a wasteful number, since it uses less digits than its factorization.

28961659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703644.

The product of its digits is 233280, while the sum is 46.

The square root of 28961659 is about 5381.6037572456. The cubic root of 28961659 is about 307.0962254993.

The spelling of 28961659 in words is "twenty-eight million, nine hundred sixty-one thousand, six hundred fifty-nine".