28600640 has 56 divisors (see below), whose sum is σ = 68701920. Its totient is φ = 11340288.

The previous prime is 28600591. The next prime is 28600669. The reversal of 28600640 is 4600682.

It is a congruent number.

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, 44159 + ... + 44801.

It is an arithmetic number, because the mean of its divisors is an integer number (1226820).

Almost surely, 2^28600640 is an apocalyptic number.

28600640 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 28600640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34350960).

28600640 is an abundant number, since it is smaller than the sum of its proper divisors (40101280).

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

28600640 is a wasteful number, since it uses less digits than its factorization.

28600640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 28600640 is about 5347.9566191210. The cubic root of 28600640 is about 305.8148594559.

The spelling of 28600640 in words is "twenty-eight million, six hundred thousand, six hundred forty".