28971949 has 4 divisors (see below), whose sum is σ = 29906560. Its totient is φ = 28037340.

The previous prime is 28971947. The next prime is 28971983. The reversal of 28971949 is 94917982.

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.

It is a cyclic number.

It is not a de Polignac number, because 28971949 - 2¹ = 28971947 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28971947) 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, 467259 + ... + 467320.

It is an arithmetic number, because the mean of its divisors is an integer number (7476640).

Almost surely, 2^28971949 is an apocalyptic number.

It is an amenable number.

28971949 is a deficient number, since it is larger than the sum of its proper divisors (934611).

28971949 is an equidigital number, since it uses as much as digits as its factorization.

28971949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934610.

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

The square root of 28971949 is about 5382.5597070539. The cubic root of 28971949 is about 307.1325913487.

The spelling of 28971949 in words is "twenty-eight million, nine hundred seventy-one thousand, nine hundred forty-nine".