28802639 has 4 divisors (see below), whose sum is σ = 28829856. Its totient is φ = 28775424.

The previous prime is 28802617. The next prime is 28802659. The reversal of 28802639 is 93620882.

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 28802639 - 2⁸ = 28802383 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 (28802659) 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, 11954 + ... + 14159.

It is an arithmetic number, because the mean of its divisors is an integer number (7207464).

Almost surely, 2^28802639 is an apocalyptic number.

28802639 is a deficient number, since it is larger than the sum of its proper divisors (27217).

28802639 is a wasteful number, since it uses less digits than its factorization.

28802639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27216.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 28802639 is about 5366.8090146753. The cubic root of 28802639 is about 306.5331351279.

The spelling of 28802639 in words is "twenty-eight million, eight hundred two thousand, six hundred thirty-nine".