28471966 has 4 divisors (see below), whose sum is σ = 42707952. Its totient is φ = 14235982.

The previous prime is 28471943. The next prime is 28471967. The reversal of 28471966 is 66917482.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28471967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7117990 + ... + 7117993.

It is an arithmetic number, because the mean of its divisors is an integer number (10676988).

Almost surely, 2^28471966 is an apocalyptic number.

28471966 is a deficient number, since it is larger than the sum of its proper divisors (14235986).

28471966 is a wasteful number, since it uses less digits than its factorization.

28471966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14235985.

The product of its digits is 145152, while the sum is 43.

The square root of 28471966 is about 5335.9128553604. The cubic root of 28471966 is about 305.3555506018.

The spelling of 28471966 in words is "twenty-eight million, four hundred seventy-one thousand, nine hundred sixty-six".