28471936 has 16 divisors (see below), whose sum is σ = 56721690. Its totient is φ = 14235904.

The previous prime is 28471913. The next prime is 28471943. The reversal of 28471936 is 63917482.

It can be written as a sum of positive squares in only one way, i.e., 27625536 + 846400 = 5256^2 + 920^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×28471936² = 1621302279176192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111091 + ... + 111346.

Almost surely, 2^28471936 is an apocalyptic number.

It is an amenable number.

28471936 is a deficient number, since it is larger than the sum of its proper divisors (28249754).

28471936 is an equidigital number, since it uses as much as digits as its factorization.

28471936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222451 (or 222439 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 28471936 is about 5335.9100442193. The cubic root of 28471936 is about 305.3554433540.

The spelling of 28471936 in words is "twenty-eight million, four hundred seventy-one thousand, nine hundred thirty-six".