72640530 has 32 divisors (see below), whose sum is σ = 193708800. Its totient is φ = 19370736.

The previous prime is 72640501. The next prime is 72640531. The reversal of 72640530 is 3504627.

It is a happy number.

72640530 is a `hidden beast` number, since 72 + 64 + 0 + 530 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72640494 and 72640503.

It is not an unprimeable number, because it can be changed into a prime (72640531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134250 + ... + 134789.

It is an arithmetic number, because the mean of its divisors is an integer number (6053400).

Almost surely, 2^72640530 is an apocalyptic number.

72640530 is an abundant number, since it is smaller than the sum of its proper divisors (121068270).

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

72640530 is a wasteful number, since it uses less digits than its factorization.

72640530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269055 (or 269049 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 72640530 is about 8522.9413936739. The cubic root of 72640530 is about 417.2467873070.

The spelling of 72640530 in words is "seventy-two million, six hundred forty thousand, five hundred thirty".