28657020 has 144 divisors (see below), whose sum is σ = 96090624. Its totient is φ = 6249600.

The previous prime is 28657009. The next prime is 28657037. The reversal of 28657020 is 2075682.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 403585 + ... + 403655.

It is an arithmetic number, because the mean of its divisors is an integer number (667296).

Almost surely, 2^28657020 is an apocalyptic number.

28657020 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 28657020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48045312).

28657020 is an abundant number, since it is smaller than the sum of its proper divisors (67433604).

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

28657020 is a wasteful number, since it uses less digits than its factorization.

28657020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 28657020 is about 5353.2251960851. The cubic root of 28657020 is about 306.0156769276.

The spelling of 28657020 in words is "twenty-eight million, six hundred fifty-seven thousand, twenty".