28070823 has 8 divisors (see below), whose sum is σ = 40830336. Its totient is φ = 17012600.

The previous prime is 28070821. The next prime is 28070831. The reversal of 28070823 is 32807082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28070823 - 2¹ = 28070821 is a prime.

It is a super-2 number, since 2×28070823² = 1575942207794658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28070821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425283 + ... + 425348.

It is an arithmetic number, because the mean of its divisors is an integer number (5103792).

Almost surely, 2^28070823 is an apocalyptic number.

28070823 is a deficient number, since it is larger than the sum of its proper divisors (12759513).

28070823 is a wasteful number, since it uses less digits than its factorization.

28070823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850645.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28070823 is about 5298.1905401750. The cubic root of 28070823 is about 303.9147058436.

The spelling of 28070823 in words is "twenty-eight million, seventy thousand, eight hundred twenty-three".