28791949 has 2 divisors, whose sum is σ = 28791950. Its totient is φ = 28791948.

The previous prime is 28791947. The next prime is 28791979. The reversal of 28791949 is 94919782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 3087049 = 5070^2 + 1757^2 .

It is a cyclic number.

It is not a de Polignac number, because 28791949 - 2¹ = 28791947 is a prime.

Together with 28791947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28791943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14395974 + 14395975.

It is an arithmetic number, because the mean of its divisors is an integer number (14395975).

Almost surely, 2^28791949 is an apocalyptic number.

It is an amenable number.

28791949 is a deficient number, since it is larger than the sum of its proper divisors (1).

28791949 is an equidigital number, since it uses as much as digits as its factorization.

28791949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 28791949 is about 5365.8129859323. The cubic root of 28791949 is about 306.4952075304.

The spelling of 28791949 in words is "twenty-eight million, seven hundred ninety-one thousand, nine hundred forty-nine".