72263440 has 40 divisors (see below), whose sum is σ = 171596160. Its totient is φ = 28288896.

The previous prime is 72263431. The next prime is 72263501. The reversal of 72263440 is 4436227.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 72263399 and 72263408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5850 + ... + 13369.

It is an arithmetic number, because the mean of its divisors is an integer number (4289904).

Almost surely, 2^72263440 is an apocalyptic number.

It is an amenable number.

72263440 is an abundant number, since it is smaller than the sum of its proper divisors (99332720).

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

72263440 is a wasteful number, since it uses less digits than its factorization.

72263440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19279 (or 19273 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 72263440 is about 8500.7905514723. The cubic root of 72263440 is about 416.5235334143.

Adding to 72263440 its reverse (4436227), we get a palindrome (76699667).

The spelling of 72263440 in words is "seventy-two million, two hundred sixty-three thousand, four hundred forty".