236422728 has 72 divisors (see below), whose sum is σ = 658254870. Its totient is φ = 76613760.

The previous prime is 236422679. The next prime is 236422733. The reversal of 236422728 is 827224632.

It is a happy number.

236422728 is a `hidden beast` number, since 2 + 3 + 642 + 2 + 7 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 233539524 + 2883204 = 15282^2 + 1698^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 236422692 and 236422701.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 835275 + ... + 835557.

Almost surely, 2^236422728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 236422728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329127435).

236422728 is an abundant number, since it is smaller than the sum of its proper divisors (421832142).

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

236422728 is a wasteful number, since it uses less digits than its factorization.

236422728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 329 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 236422728 is about 15376.0439645573. The cubic root of 236422728 is about 618.3434167599.

The spelling of 236422728 in words is "two hundred thirty-six million, four hundred twenty-two thousand, seven hundred twenty-eight".