284772138 has 32 divisors (see below), whose sum is σ = 671907840. Its totient is φ = 78738480.

The previous prime is 284772119. The next prime is 284772139. The reversal of 284772138 is 831277482.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 284772138.

It is not an unprimeable number, because it can be changed into a prime (284772139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108058 + ... + 110661.

It is an arithmetic number, because the mean of its divisors is an integer number (20997120).

Almost surely, 2^284772138 is an apocalyptic number.

284772138 is an abundant number, since it is smaller than the sum of its proper divisors (387135702).

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

284772138 is a wasteful number, since it uses less digits than its factorization.

284772138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218762.

The product of its digits is 150528, while the sum is 42.

The square root of 284772138 is about 16875.1929766744. The cubic root of 284772138 is about 657.9090067969.

The spelling of 284772138 in words is "two hundred eighty-four million, seven hundred seventy-two thousand, one hundred thirty-eight".