28691648 has 28 divisors (see below), whose sum is σ = 60286392. Its totient is φ = 13501440.

The previous prime is 28691633. The next prime is 28691651. The reversal of 28691648 is 84619682.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28691599 and 28691608.

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, 12098 + ... + 14273.

Almost surely, 2^28691648 is an apocalyptic number.

It is an amenable number.

28691648 is an abundant number, since it is smaller than the sum of its proper divisors (31594744).

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

28691648 is a wasteful number, since it uses less digits than its factorization.

28691648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26400 (or 26390 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 28691648 is about 5356.4585315300. The cubic root of 28691648 is about 306.1388863601.

The spelling of 28691648 in words is "twenty-eight million, six hundred ninety-one thousand, six hundred forty-eight".