28961971 has 4 divisors (see below), whose sum is σ = 28972944. Its totient is φ = 28951000.

The previous prime is 28961963. The next prime is 28961983. The reversal of 28961971 is 17916982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28961971 - 2³ = 28961963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28931971) 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, 1146 + ... + 7696.

It is an arithmetic number, because the mean of its divisors is an integer number (7243236).

Almost surely, 2^28961971 is an apocalyptic number.

28961971 is a deficient number, since it is larger than the sum of its proper divisors (10973).

28961971 is an equidigital number, since it uses as much as digits as its factorization.

28961971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10972.

The product of its digits is 54432, while the sum is 43.

The square root of 28961971 is about 5381.6327448090. The cubic root of 28961971 is about 307.0973282639.

The spelling of 28961971 in words is "twenty-eight million, nine hundred sixty-one thousand, nine hundred seventy-one".