28773120 has 144 divisors (see below), whose sum is σ = 94187520. Its totient is φ = 7483392.

The previous prime is 28773119. The next prime is 28773131. The reversal of 28773120 is 2137782.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226497 + ... + 226623.

It is an arithmetic number, because the mean of its divisors is an integer number (654080).

Almost surely, 2^28773120 is an apocalyptic number.

28773120 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 28773120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47093760).

28773120 is an abundant number, since it is smaller than the sum of its proper divisors (65414400).

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

28773120 is a wasteful number, since it uses less digits than its factorization.

28773120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 28773120 is about 5364.0581652327. The cubic root of 28773120 is about 306.4283803220.

The spelling of 28773120 in words is "twenty-eight million, seven hundred seventy-three thousand, one hundred twenty".