28862321 has 4 divisors (see below), whose sum is σ = 28964592. Its totient is φ = 28760052.

The previous prime is 28862303. The next prime is 28862329. The reversal of 28862321 is 12326882.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12326882 = 2 ⋅6163441.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28862321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28862329) 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, 50711 + ... + 51276.

It is an arithmetic number, because the mean of its divisors is an integer number (7241148).

Almost surely, 2^28862321 is an apocalyptic number.

It is an amenable number.

28862321 is a deficient number, since it is larger than the sum of its proper divisors (102271).

28862321 is a wasteful number, since it uses less digits than its factorization.

28862321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102270.

The product of its digits is 9216, while the sum is 32.

The square root of 28862321 is about 5372.3664245842. The cubic root of 28862321 is about 306.7447116790.

The spelling of 28862321 in words is "twenty-eight million, eight hundred sixty-two thousand, three hundred twenty-one".