28615320 has 96 divisors (see below), whose sum is σ = 94039920. Its totient is φ = 7545600.

The previous prime is 28615313. The next prime is 28615333. The reversal of 28615320 is 2351682.

28615320 is a `hidden beast` number, since 28 + 615 + 3 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35967 + ... + 36753.

Almost surely, 2^28615320 is an apocalyptic number.

28615320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28615320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47019960).

28615320 is an abundant number, since it is smaller than the sum of its proper divisors (65424600).

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

28615320 is a wasteful number, since it uses less digits than its factorization.

28615320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28615320 is about 5349.3289298752. The cubic root of 28615320 is about 305.8671729037.

The spelling of 28615320 in words is "twenty-eight million, six hundred fifteen thousand, three hundred twenty".