28471906 has 8 divisors (see below), whose sum is σ = 45220140. Its totient is φ = 13398528.

The previous prime is 28471903. The next prime is 28471913. The reversal of 28471906 is 60917482.

It can be written as a sum of positive squares in 2 ways, for example, as 28355625 + 116281 = 5325^2 + 341^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28471903) 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, 418671 + ... + 418738.

Almost surely, 2^28471906 is an apocalyptic number.

28471906 is a deficient number, since it is larger than the sum of its proper divisors (16748234).

28471906 is a wasteful number, since it uses less digits than its factorization.

28471906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837428.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28471906 is about 5335.9072330767. The cubic root of 28471906 is about 305.3553361061.

It can be divided in two parts, 2847 and 1906, that added together give a triangular number (4753 = T₉₇).

The spelling of 28471906 in words is "twenty-eight million, four hundred seventy-one thousand, nine hundred six".