28615680 has 264 divisors, whose sum is σ = 107295552. Its totient is φ = 7299072.

The previous prime is 28615673. The next prime is 28615693. The reversal of 28615680 is 8651682.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1244149 + ... + 1244171.

Almost surely, 2^28615680 is an apocalyptic number.

28615680 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 28615680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53647776).

28615680 is an abundant number, since it is smaller than the sum of its proper divisors (78679872).

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

28615680 is an equidigital number, since it uses as much as digits as its factorization.

28615680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28615680 is about 5349.3625788499. The cubic root of 28615680 is about 305.8684555700.

The spelling of 28615680 in words is "twenty-eight million, six hundred fifteen thousand, six hundred eighty".