28471947 has 8 divisors (see below), whose sum is σ = 43385856. Its totient is φ = 16269672.

The previous prime is 28471943. The next prime is 28471967. The reversal of 28471947 is 74917482.

It is a happy number.

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

It is not a de Polignac number, because 28471947 - 2² = 28471943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28471899 and 28471908.

It is not an unprimeable number, because it can be changed into a prime (28471943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 677883 + ... + 677924.

It is an arithmetic number, because the mean of its divisors is an integer number (5423232).

Almost surely, 2^28471947 is an apocalyptic number.

28471947 is a deficient number, since it is larger than the sum of its proper divisors (14913909).

28471947 is a wasteful number, since it uses less digits than its factorization.

28471947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355817.

The product of its digits is 112896, while the sum is 42.

The square root of 28471947 is about 5335.9110749712. The cubic root of 28471947 is about 305.3554826782.

The spelling of 28471947 in words is "twenty-eight million, four hundred seventy-one thousand, nine hundred forty-seven".