28215867 has 8 divisors (see below), whose sum is σ = 38638096. Its totient is φ = 18302112.

The previous prime is 28215851. The next prime is 28215899. The reversal of 28215867 is 76851282.

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

It is not a de Polignac number, because 28215867 - 2⁴ = 28215851 is a prime.

It is a super-2 number, since 2×28215867² = 1592270301123378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28215067) 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, 126988 + ... + 127209.

It is an arithmetic number, because the mean of its divisors is an integer number (4829762).

Almost surely, 2^28215867 is an apocalyptic number.

28215867 is a deficient number, since it is larger than the sum of its proper divisors (10422229).

28215867 is a wasteful number, since it uses less digits than its factorization.

28215867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254237.

The product of its digits is 53760, while the sum is 39.

The square root of 28215867 is about 5311.8609733313. The cubic root of 28215867 is about 304.4372567088.

The spelling of 28215867 in words is "twenty-eight million, two hundred fifteen thousand, eight hundred sixty-seven".