28478793 has 8 divisors (see below), whose sum is σ = 43396288. Its totient is φ = 16273584.

The previous prime is 28478773. The next prime is 28478797. The reversal of 28478793 is 39787482.

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

It is not a de Polignac number, because 28478793 - 2⁸ = 28478537 is a prime.

It is a super-2 number, since 2×28478793² = 1622083301473698, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28478797) 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, 678046 + ... + 678087.

It is an arithmetic number, because the mean of its divisors is an integer number (5424536).

Almost surely, 2^28478793 is an apocalyptic number.

It is an amenable number.

28478793 is a deficient number, since it is larger than the sum of its proper divisors (14917495).

28478793 is a wasteful number, since it uses less digits than its factorization.

28478793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356143.

The product of its digits is 677376, while the sum is 48.

The square root of 28478793 is about 5336.5525388588. The cubic root of 28478793 is about 305.3799546741.

The spelling of 28478793 in words is "twenty-eight million, four hundred seventy-eight thousand, seven hundred ninety-three".