28307798 has 4 divisors (see below), whose sum is σ = 42461700. Its totient is φ = 14153898.

The previous prime is 28307789. The next prime is 28307809. The reversal of 28307798 is 89770382.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7076948 + ... + 7076951.

It is an arithmetic number, because the mean of its divisors is an integer number (10615425).

Almost surely, 2^28307798 is an apocalyptic number.

28307798 is a deficient number, since it is larger than the sum of its proper divisors (14153902).

28307798 is a wasteful number, since it uses less digits than its factorization.

28307798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14153901.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 28307798 is about 5320.5073066391. The cubic root of 28307798 is about 304.7675304633.

The spelling of 28307798 in words is "twenty-eight million, three hundred seven thousand, seven hundred ninety-eight".