28716471 has 16 divisors (see below), whose sum is σ = 48620800. Its totient is φ = 16409304.

The previous prime is 28716463. The next prime is 28716481. The reversal of 28716471 is 17461782.

28716471 is a `hidden beast` number, since 2 + 8 + 7 + 1 + 647 + 1 = 666.

It is not a de Polignac number, because 28716471 - 2³ = 28716463 is a prime.

It is a super-3 number, since 3×28716471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28716431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75781 + ... + 76158.

It is an arithmetic number, because the mean of its divisors is an integer number (3038800).

Almost surely, 2^28716471 is an apocalyptic number.

28716471 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28716471 is a deficient number, since it is larger than the sum of its proper divisors (19904329).

28716471 is a wasteful number, since it uses less digits than its factorization.

28716471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151955 (or 151949 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 28716471 is about 5358.7751398990. The cubic root of 28716471 is about 306.2271477603.

The spelling of 28716471 in words is "twenty-eight million, seven hundred sixteen thousand, four hundred seventy-one".