28478715 has 48 divisors (see below), whose sum is σ = 49424928. Its totient is φ = 13989888.

The previous prime is 28478707. The next prime is 28478717. The reversal of 28478715 is 51787482.

It is not a de Polignac number, because 28478715 - 2³ = 28478707 is a prime.

It is a super-2 number, since 2×28478715² = 1622074416102450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28478717) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 293547 + ... + 293643.

It is an arithmetic number, because the mean of its divisors is an integer number (1029686).

Almost surely, 2^28478715 is an apocalyptic number.

28478715 is a deficient number, since it is larger than the sum of its proper divisors (20946213).

28478715 is a wasteful number, since it uses less digits than its factorization.

28478715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 165 counting only the distinct ones).

The product of its digits is 125440, while the sum is 42.

The square root of 28478715 is about 5336.5452307649. The cubic root of 28478715 is about 305.3796758741.

The spelling of 28478715 in words is "twenty-eight million, four hundred seventy-eight thousand, seven hundred fifteen".