72784232 has 8 divisors (see below), whose sum is σ = 136470450. Its totient is φ = 36392112.

The previous prime is 72784223. The next prime is 72784237. The reversal of 72784232 is 23248727.

It can be written as a sum of positive squares in only one way, i.e., 59197636 + 13586596 = 7694^2 + 3686^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 72784192 and 72784201.

It is not an unprimeable number, because it can be changed into a prime (72784237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4549007 + ... + 4549022.

Almost surely, 2^72784232 is an apocalyptic number.

It is an amenable number.

72784232 is a deficient number, since it is larger than the sum of its proper divisors (63686218).

72784232 is a wasteful number, since it uses less digits than its factorization.

72784232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9098035 (or 9098031 counting only the distinct ones).

The product of its digits is 37632, while the sum is 35.

The square root of 72784232 is about 8531.3675339889. The cubic root of 72784232 is about 417.5217472268.

The spelling of 72784232 in words is "seventy-two million, seven hundred eighty-four thousand, two hundred thirty-two".