28959961 has 4 divisors (see below), whose sum is σ = 29097424. Its totient is φ = 28822500.

The previous prime is 28959947. The next prime is 28959989. The reversal of 28959961 is 16995982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16995982 = 2 ⋅8497991.

It is a cyclic number.

It is not a de Polignac number, because 28959961 - 2⁵ = 28959929 is a prime.

It is a super-2 number, since 2×28959961² = 1677358682243042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28959361) 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, 68415 + ... + 68836.

It is an arithmetic number, because the mean of its divisors is an integer number (7274356).

Almost surely, 2^28959961 is an apocalyptic number.

It is an amenable number.

28959961 is a deficient number, since it is larger than the sum of its proper divisors (137463).

28959961 is a wasteful number, since it uses less digits than its factorization.

28959961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137462.

The product of its digits is 349920, while the sum is 49.

The square root of 28959961 is about 5381.4459952693. The cubic root of 28959961 is about 307.0902237761.

The spelling of 28959961 in words is "twenty-eight million, nine hundred fifty-nine thousand, nine hundred sixty-one".