28870667 has 4 divisors (see below), whose sum is σ = 32995056. Its totient is φ = 24746280.

The previous prime is 28870663. The next prime is 28870669. The reversal of 28870667 is 76607882.

It is a happy number.

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 28870667 - 2² = 28870663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28870661) 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, 2062184 + ... + 2062197.

It is an arithmetic number, because the mean of its divisors is an integer number (8248764).

Almost surely, 2^28870667 is an apocalyptic number.

28870667 is a deficient number, since it is larger than the sum of its proper divisors (4124389).

28870667 is an equidigital number, since it uses as much as digits as its factorization.

28870667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124388.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 28870667 is about 5373.1431211164. The cubic root of 28870667 is about 306.7742755366.

The spelling of 28870667 in words is "twenty-eight million, eight hundred seventy thousand, six hundred sixty-seven".