28029961 has 2 divisors, whose sum is σ = 28029962. Its totient is φ = 28029960.

The previous prime is 28029943. The next prime is 28029971. The reversal of 28029961 is 16992082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26419600 + 1610361 = 5140^2 + 1269^2 .

It is a cyclic number.

It is not a de Polignac number, because 28029961 - 2⁵ = 28029929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28029961.

It is not a weakly prime, because it can be changed into another prime (28029901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14014980 + 14014981.

It is an arithmetic number, because the mean of its divisors is an integer number (14014981).

Almost surely, 2^28029961 is an apocalyptic number.

It is an amenable number.

28029961 is a deficient number, since it is larger than the sum of its proper divisors (1).

28029961 is an equidigital number, since it uses as much as digits as its factorization.

28029961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 28029961 is about 5294.3329135973. The cubic root of 28029961 is about 303.7671672008.

The spelling of 28029961 in words is "twenty-eight million, twenty-nine thousand, nine hundred sixty-one".