28147493 has 8 divisors (see below), whose sum is σ = 32322720. Its totient is φ = 24241680.

The previous prime is 28147481. The next prime is 28147507. The reversal of 28147493 is 39474182.

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 28147493 - 2¹⁴ = 28131109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28147403) 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, 67130 + ... + 67547.

It is an arithmetic number, because the mean of its divisors is an integer number (4040340).

Almost surely, 2^28147493 is an apocalyptic number.

It is an amenable number.

28147493 is a deficient number, since it is larger than the sum of its proper divisors (4175227).

28147493 is a wasteful number, since it uses less digits than its factorization.

28147493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134707.

The product of its digits is 48384, while the sum is 38.

The square root of 28147493 is about 5305.4210954457. The cubic root of 28147493 is about 304.1911489728.

It can be divided in two parts, 281 and 47493, that added together give a palindrome (47774).

The spelling of 28147493 in words is "twenty-eight million, one hundred forty-seven thousand, four hundred ninety-three".