72145530 has 24 divisors (see below), whose sum is σ = 187578612. Its totient is φ = 19238784.

The previous prime is 72145483. The next prime is 72145553. The reversal of 72145530 is 3554127.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 70610409 + 1535121 = 8403^2 + 1239^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72145494 and 72145503.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 400719 + ... + 400898.

Almost surely, 2^72145530 is an apocalyptic number.

72145530 is an abundant number, since it is smaller than the sum of its proper divisors (115433082).

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

72145530 is a wasteful number, since it uses less digits than its factorization.

72145530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801630 (or 801627 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 72145530 is about 8493.8524828254. The cubic root of 72145530 is about 416.2968672711.

Adding to 72145530 its reverse (3554127), we get a palindrome (75699657).

The spelling of 72145530 in words is "seventy-two million, one hundred forty-five thousand, five hundred thirty".