72450220 has 12 divisors (see below), whose sum is σ = 152145504. Its totient is φ = 28980080.

The previous prime is 72450197. The next prime is 72450223. The reversal of 72450220 is 2205427.

It is a junction number, because it is equal to n+sod(n) for n = 72450191 and 72450200.

It is not an unprimeable number, because it can be changed into a prime (72450223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1811236 + ... + 1811275.

It is an arithmetic number, because the mean of its divisors is an integer number (12678792).

Almost surely, 2^72450220 is an apocalyptic number.

It is an amenable number.

72450220 is an abundant number, since it is smaller than the sum of its proper divisors (79695284).

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

72450220 is a wasteful number, since it uses less digits than its factorization.

72450220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622520 (or 3622518 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 72450220 is about 8511.7694987588. The cubic root of 72450220 is about 416.8820887825.

Adding to 72450220 its reverse (2205427), we get a palindrome (74655647).

The spelling of 72450220 in words is "seventy-two million, four hundred fifty thousand, two hundred twenty".