28870473 has 4 divisors (see below), whose sum is σ = 38493968. Its totient is φ = 19246980.

The previous prime is 28870469. The next prime is 28870477. The reversal of 28870473 is 37407882.

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 an interprime number because it is at equal distance from previous prime (28870469) and next prime (28870477).

It is not a de Polignac number, because 28870473 - 2² = 28870469 is a prime.

It is a super-2 number, since 2×28870473² = 1667008422487458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28870477) 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, 4811743 + ... + 4811748.

It is an arithmetic number, because the mean of its divisors is an integer number (9623492).

Almost surely, 2^28870473 is an apocalyptic number.

It is an amenable number.

28870473 is a deficient number, since it is larger than the sum of its proper divisors (9623495).

28870473 is an equidigital number, since it uses as much as digits as its factorization.

28870473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9623494.

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 28870473 is about 5373.1250683378. The cubic root of 28870473 is about 306.7735883992.

The spelling of 28870473 in words is "twenty-eight million, eight hundred seventy thousand, four hundred seventy-three".