28579381 has 8 divisors (see below), whose sum is σ = 28892160. Its totient is φ = 28268688.

The previous prime is 28579361. The next prime is 28579393. The reversal of 28579381 is 18397582.

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

It is a cyclic number.

It is not a de Polignac number, because 28579381 - 2¹¹ = 28577333 is a prime.

It is a super-2 number, since 2×28579381² = 1633562036686322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28579301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46780 + ... + 47386.

It is an arithmetic number, because the mean of its divisors is an integer number (3611520).

Almost surely, 2^28579381 is an apocalyptic number.

It is an amenable number.

28579381 is a deficient number, since it is larger than the sum of its proper divisors (312779).

28579381 is a wasteful number, since it uses less digits than its factorization.

28579381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043.

The product of its digits is 120960, while the sum is 43.

The square root of 28579381 is about 5345.9686680713. The cubic root of 28579381 is about 305.7390694318.

The spelling of 28579381 in words is "twenty-eight million, five hundred seventy-nine thousand, three hundred eighty-one".