72780222 has 16 divisors (see below), whose sum is σ = 153221760. Its totient is φ = 22983192.

The previous prime is 72780199. The next prime is 72780229. The reversal of 72780222 is 22208727.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 72780222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72780229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319098 + ... + 319325.

It is an arithmetic number, because the mean of its divisors is an integer number (9576360).

Almost surely, 2^72780222 is an apocalyptic number.

72780222 is an abundant number, since it is smaller than the sum of its proper divisors (80441538).

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

72780222 is a wasteful number, since it uses less digits than its factorization.

72780222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638447.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 72780222 is about 8531.1325156746. The cubic root of 72780222 is about 417.5140793894.

Adding to 72780222 its reverse (22208727), we get a palindrome (94988949).

The spelling of 72780222 in words is "seventy-two million, seven hundred eighty thousand, two hundred twenty-two".