28392473 has 4 divisors (see below), whose sum is σ = 28412160. Its totient is φ = 28372788.

The previous prime is 28392467. The next prime is 28392487. The reversal of 28392473 is 37429382.

It is a happy number.

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: 37429382 = 2 ⋅18714691.

It is a cyclic number.

It is not a de Polignac number, because 28392473 - 2⁴ = 28392457 is a prime.

It is a super-2 number, since 2×28392473² = 1612265046111458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28392433) 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, 7493 + ... + 10626.

It is an arithmetic number, because the mean of its divisors is an integer number (7103040).

Almost surely, 2^28392473 is an apocalyptic number.

It is an amenable number.

28392473 is a deficient number, since it is larger than the sum of its proper divisors (19687).

28392473 is a wasteful number, since it uses less digits than its factorization.

28392473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19686.

The product of its digits is 72576, while the sum is 38.

The square root of 28392473 is about 5328.4587828001. The cubic root of 28392473 is about 305.0711040888.

The spelling of 28392473 in words is "twenty-eight million, three hundred ninety-two thousand, four hundred seventy-three".