28870351 has 4 divisors (see below), whose sum is σ = 28883304. Its totient is φ = 28857400.

The previous prime is 28870349. The next prime is 28870363. The reversal of 28870351 is 15307882.

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

It is a cyclic number.

It is not a de Polignac number, because 28870351 - 2¹ = 28870349 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 (28870321) 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, 2185 + ... + 7906.

It is an arithmetic number, because the mean of its divisors is an integer number (7220826).

Almost surely, 2^28870351 is an apocalyptic number.

28870351 is a deficient number, since it is larger than the sum of its proper divisors (12953).

28870351 is a wasteful number, since it uses less digits than its factorization.

28870351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12952.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 28870351 is about 5373.1137155285. The cubic root of 28870351 is about 306.7731562803.

The spelling of 28870351 in words is "twenty-eight million, eight hundred seventy thousand, three hundred fifty-one".