28539790 has 8 divisors (see below), whose sum is σ = 51371640. Its totient is φ = 11415912.

The previous prime is 28539781. The next prime is 28539853. The reversal of 28539790 is 9793582.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28539790² = 1629039226488200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1426980 + ... + 1426999.

It is an arithmetic number, because the mean of its divisors is an integer number (6421455).

Almost surely, 2^28539790 is an apocalyptic number.

28539790 is a deficient number, since it is larger than the sum of its proper divisors (22831850).

28539790 is a wasteful number, since it uses less digits than its factorization.

28539790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2853986.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 28539790 is about 5342.2645011268. The cubic root of 28539790 is about 305.5978241373.

The spelling of 28539790 in words is "twenty-eight million, five hundred thirty-nine thousand, seven hundred ninety".