28478733 has 4 divisors (see below), whose sum is σ = 37971648. Its totient is φ = 18985820.

The previous prime is 28478719. The next prime is 28478743. The reversal of 28478733 is 33787482.

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.

It is a cyclic number.

It is not a de Polignac number, because 28478733 - 2⁴ = 28478717 is a prime.

It is a super-2 number, since 2×28478733² = 1622076466570578, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478743) 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, 4746453 + ... + 4746458.

It is an arithmetic number, because the mean of its divisors is an integer number (9492912).

Almost surely, 2^28478733 is an apocalyptic number.

It is an amenable number.

28478733 is a deficient number, since it is larger than the sum of its proper divisors (9492915).

28478733 is an equidigital number, since it uses as much as digits as its factorization.

28478733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9492914.

The product of its digits is 225792, while the sum is 42.

The square root of 28478733 is about 5336.5469172490. The cubic root of 28478733 is about 305.3797402126.

The spelling of 28478733 in words is "twenty-eight million, four hundred seventy-eight thousand, seven hundred thirty-three".