28002961 has 12 divisors (see below), whose sum is σ = 34492068. Its totient is φ = 22589952.

The previous prime is 28002907. The next prime is 28002971. The reversal of 28002961 is 16920082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12250000 + 15752961 = 3500^2 + 3969^2 .

It is not a de Polignac number, because 28002961 - 2¹⁵ = 27970193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28002901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15976 + ... + 17641.

It is an arithmetic number, because the mean of its divisors is an integer number (2874339).

Almost surely, 2^28002961 is an apocalyptic number.

It is an amenable number.

28002961 is a deficient number, since it is larger than the sum of its proper divisors (6489107).

28002961 is a wasteful number, since it uses less digits than its factorization.

28002961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33648 (or 33641 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28002961 is about 5291.7824029338. The cubic root of 28002961 is about 303.6696007864.

The spelling of 28002961 in words is "twenty-eight million, two thousand, nine hundred sixty-one".