28839907 has 4 divisors (see below), whose sum is σ = 30093840. Its totient is φ = 27585976.

The previous prime is 28839893. The next prime is 28839911. The reversal of 28839907 is 70993882.

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 28839907 - 2⁷ = 28839779 is a prime.

It is a super-5 number, since 5×28839907⁵ (a number of 38 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28839947) 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, 626932 + ... + 626977.

It is an arithmetic number, because the mean of its divisors is an integer number (7523460).

Almost surely, 2^28839907 is an apocalyptic number.

28839907 is a deficient number, since it is larger than the sum of its proper divisors (1253933).

28839907 is a wasteful number, since it uses less digits than its factorization.

28839907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253932.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 28839907 is about 5370.2799740796. The cubic root of 28839907 is about 306.6652868295.

The spelling of 28839907 in words is "twenty-eight million, eight hundred thirty-nine thousand, nine hundred seven".