72220730 has 16 divisors (see below), whose sum is σ = 134480520. Its totient is φ = 27892032.

The previous prime is 72220727. The next prime is 72220787. The reversal of 72220730 is 3702227.

It can be written as a sum of positive squares in 4 ways, for example, as 71859529 + 361201 = 8477^2 + 601^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72220696 and 72220705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124229 + ... + 124808.

Almost surely, 2^72220730 is an apocalyptic number.

72220730 is a deficient number, since it is larger than the sum of its proper divisors (62259790).

72220730 is a wasteful number, since it uses less digits than its factorization.

72220730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249073.

The product of its (nonzero) digits is 1176, while the sum is 23.

The square root of 72220730 is about 8498.2780608780. The cubic root of 72220730 is about 416.4414576739.

Adding to 72220730 its reverse (3702227), we get a palindrome (75922957).

The spelling of 72220730 in words is "seventy-two million, two hundred twenty thousand, seven hundred thirty".