28471965 has 8 divisors (see below), whose sum is σ = 45555168. Its totient is φ = 15185040.

The previous prime is 28471943. The next prime is 28471967. The reversal of 28471965 is 56917482.

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

It is not a de Polignac number, because 28471965 - 2¹² = 28467869 is a prime.

It is a super-2 number, since 2×28471965² = 1621305581922450, which contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 949051 + ... + 949080.

It is an arithmetic number, because the mean of its divisors is an integer number (5694396).

Almost surely, 2^28471965 is an apocalyptic number.

It is an amenable number.

28471965 is a deficient number, since it is larger than the sum of its proper divisors (17083203).

28471965 is a wasteful number, since it uses less digits than its factorization.

28471965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898139.

The product of its digits is 120960, while the sum is 42.

The square root of 28471965 is about 5335.9127616557. The cubic root of 28471965 is about 305.3555470269.

The spelling of 28471965 in words is "twenty-eight million, four hundred seventy-one thousand, nine hundred sixty-five".