28615808 has 64 divisors (see below), whose sum is σ = 63617400. Its totient is φ = 12730368.

The previous prime is 28615799. The next prime is 28615817. The reversal of 28615808 is 80851682.

It is an interprime number because it is at equal distance from previous prime (28615799) and next prime (28615817).

It can be written as a sum of positive squares in 4 ways, for example, as 21603904 + 7011904 = 4648^2 + 2648^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47960 + ... + 48552.

Almost surely, 2^28615808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28615808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31808700).

28615808 is an abundant number, since it is smaller than the sum of its proper divisors (35001592).

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

28615808 is a wasteful number, since it uses less digits than its factorization.

28615808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 28615808 is about 5349.3745428788. The cubic root of 28615808 is about 305.8689116266.

The spelling of 28615808 in words is "twenty-eight million, six hundred fifteen thousand, eight hundred eight".