28478964 has 12 divisors (see below), whose sum is σ = 66450944. Its totient is φ = 9492984.

The previous prime is 28478959. The next prime is 28478971. The reversal of 28478964 is 46987482.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28478964² = 1622102781026592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186612 + ... + 1186635.

Almost surely, 2^28478964 is an apocalyptic number.

It is an amenable number.

28478964 is an abundant number, since it is smaller than the sum of its proper divisors (37971980).

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

28478964 is a wasteful number, since it uses less digits than its factorization.

28478964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373254 (or 2373252 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 28478964 is about 5336.5685604141. The cubic root of 28478964 is about 305.3805658876.

It can be divided in two parts, 2847 and 8964, that added together give a palindrome (11811).

The spelling of 28478964 in words is "twenty-eight million, four hundred seventy-eight thousand, nine hundred sixty-four".