72220530 has 16 divisors (see below), whose sum is σ = 173329344. Its totient is φ = 19258800.

The previous prime is 72220517. The next prime is 72220531. The reversal of 72220530 is 3502227.

It is a junction number, because it is equal to n+sod(n) for n = 72220497 and 72220506.

It is not an unprimeable number, because it can be changed into a prime (72220531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1203646 + ... + 1203705.

It is an arithmetic number, because the mean of its divisors is an integer number (10833084).

Almost surely, 2^72220530 is an apocalyptic number.

72220530 is an abundant number, since it is smaller than the sum of its proper divisors (101108814).

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

72220530 is a wasteful number, since it uses less digits than its factorization.

72220530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407361.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 72220530 is about 8498.2662937802. The cubic root of 72220530 is about 416.4410732581.

Adding to 72220530 its reverse (3502227), we get a palindrome (75722757).

The spelling of 72220530 in words is "seventy-two million, two hundred twenty thousand, five hundred thirty".