28493953 has 4 divisors (see below), whose sum is σ = 28643328. Its totient is φ = 28344580.

The previous prime is 28493951. The next prime is 28493963. The reversal of 28493953 is 35939482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35939482 = 2 ⋅17969741.

It is a cyclic number.

It is not a de Polignac number, because 28493953 - 2¹ = 28493951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28493951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74401 + ... + 74782.

It is an arithmetic number, because the mean of its divisors is an integer number (7160832).

Almost surely, 2^28493953 is an apocalyptic number.

It is an amenable number.

28493953 is a deficient number, since it is larger than the sum of its proper divisors (149375).

28493953 is a wasteful number, since it uses less digits than its factorization.

28493953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149374.

The product of its digits is 233280, while the sum is 43.

The square root of 28493953 is about 5337.9727425306. The cubic root of 28493953 is about 305.4341322847.

The spelling of 28493953 in words is "twenty-eight million, four hundred ninety-three thousand, nine hundred fifty-three".