28858820 has 12 divisors (see below), whose sum is σ = 60603564. Its totient is φ = 11543520.

The previous prime is 28858807. The next prime is 28858867. The reversal of 28858820 is 2885882.

It can be written as a sum of positive squares in 2 ways, for example, as 18113536 + 10745284 = 4256^2 + 3278^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721451 + ... + 721490.

It is an arithmetic number, because the mean of its divisors is an integer number (5050297).

Almost surely, 2^28858820 is an apocalyptic number.

28858820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28858820 is an abundant number, since it is smaller than the sum of its proper divisors (31744744).

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

28858820 is a wasteful number, since it uses less digits than its factorization.

28858820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442950 (or 1442948 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 41.

The square root of 28858820 is about 5372.0405806360. The cubic root of 28858820 is about 306.7323084647.

The spelling of 28858820 in words is "twenty-eight million, eight hundred fifty-eight thousand, eight hundred twenty".