28530806 has 4 divisors (see below), whose sum is σ = 42796212. Its totient is φ = 14265402.

The previous prime is 28530797. The next prime is 28530823. The reversal of 28530806 is 60803582.

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

It is a super-4 number, since 4×28530806⁴ (a number of 31 digits) contains 4444 as substring.

It is a plaindrome in base 15.

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, 7132700 + ... + 7132703.

It is an arithmetic number, because the mean of its divisors is an integer number (10699053).

Almost surely, 2^28530806 is an apocalyptic number.

28530806 is a deficient number, since it is larger than the sum of its proper divisors (14265406).

28530806 is a wasteful number, since it uses less digits than its factorization.

28530806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14265405.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 28530806 is about 5341.4235930134. The cubic root of 28530806 is about 305.5657545368.

The spelling of 28530806 in words is "twenty-eight million, five hundred thirty thousand, eight hundred six".