283128720 has 160 divisors (see below), whose sum is σ = 1011744768. Its totient is φ = 64157184.

The previous prime is 283128697. The next prime is 283128737. The reversal of 283128720 is 27821382.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212697 + ... + 214023.

Almost surely, 2^283128720 is an apocalyptic number.

283128720 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 283128720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (505872384).

283128720 is an abundant number, since it is smaller than the sum of its proper divisors (728616048).

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

283128720 is a wasteful number, since it uses less digits than its factorization.

283128720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477 (or 1471 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 283128720 is about 16826.4292112141. The cubic root of 283128720 is about 656.6409682998.

The spelling of 283128720 in words is "two hundred eighty-three million, one hundred twenty-eight thousand, seven hundred twenty".