28471356 has 18 divisors (see below), whose sum is σ = 71969352. Its totient is φ = 9490440.

The previous prime is 28471349. The next prime is 28471411. The reversal of 28471356 is 65317482.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×28471356² = 1621236224957472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 790871 = 28471356 / (2 + 8 + 4 + 7 + 1 + 3 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 28471356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 395400 + ... + 395471.

Almost surely, 2^28471356 is an apocalyptic number.

It is an amenable number.

28471356 is an abundant number, since it is smaller than the sum of its proper divisors (43497996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28471356 is a wasteful number, since it uses less digits than its factorization.

28471356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790881 (or 790876 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 28471356 is about 5335.8556952002. The cubic root of 28471356 is about 305.3533698811.

The spelling of 28471356 in words is "twenty-eight million, four hundred seventy-one thousand, three hundred fifty-six".