28958820 has 192 divisors, whose sum is σ = 97977600. Its totient is φ = 6307840.

The previous prime is 28958779. The next prime is 28958851. The reversal of 28958820 is 2885982.

It is a super-2 number, since 2×28958820² = 1677226511584800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 325336 + ... + 325424.

It is an arithmetic number, because the mean of its divisors is an integer number (510300).

Almost surely, 2^28958820 is an apocalyptic number.

28958820 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 28958820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48988800).

28958820 is an abundant number, since it is smaller than the sum of its proper divisors (69018780).

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

28958820 is a wasteful number, since it uses less digits than its factorization.

28958820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 28958820 is about 5381.3399818261. The cubic root of 28958820 is about 307.0861906843.

The spelling of 28958820 in words is "twenty-eight million, nine hundred fifty-eight thousand, eight hundred twenty".