28970279 has 4 divisors (see below), whose sum is σ = 31198776. Its totient is φ = 26741784.

The previous prime is 28970267. The next prime is 28970287. The reversal of 28970279 is 97207982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28970279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28970209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1114229 + ... + 1114254.

It is an arithmetic number, because the mean of its divisors is an integer number (7799694).

Almost surely, 2^28970279 is an apocalyptic number.

28970279 is a deficient number, since it is larger than the sum of its proper divisors (2228497).

28970279 is a wasteful number, since it uses less digits than its factorization.

28970279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228496.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 28970279 is about 5382.4045741657. The cubic root of 28970279 is about 307.1266899935.

The spelling of 28970279 in words is "twenty-eight million, nine hundred seventy thousand, two hundred seventy-nine".