28615648 has 12 divisors (see below), whose sum is σ = 56337120. Its totient is φ = 14307808.

The previous prime is 28615619. The next prime is 28615673. The reversal of 28615648 is 84651682.

It is a super-3 number, since 3×28615648³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28615648.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 447088 + ... + 447151.

It is an arithmetic number, because the mean of its divisors is an integer number (4694760).

Almost surely, 2^28615648 is an apocalyptic number.

It is an amenable number.

28615648 is a deficient number, since it is larger than the sum of its proper divisors (27721472).

28615648 is an equidigital number, since it uses as much as digits as its factorization.

28615648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894249 (or 894241 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 28615648 is about 5349.3595878385. The cubic root of 28615648 is about 305.8683415557.

The spelling of 28615648 in words is "twenty-eight million, six hundred fifteen thousand, six hundred forty-eight".