72287538 has 16 divisors (see below), whose sum is σ = 144772320. Its totient is φ = 24062976.

The previous prime is 72287521. The next prime is 72287549. The reversal of 72287538 is 83578227.

It is a self number, because there is not a number n which added to its sum of digits gives 72287538.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3220 + ... + 12447.

It is an arithmetic number, because the mean of its divisors is an integer number (9048270).

Almost surely, 2^72287538 is an apocalyptic number.

72287538 is an abundant number, since it is smaller than the sum of its proper divisors (72484782).

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

72287538 is a wasteful number, since it uses less digits than its factorization.

72287538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16441.

The product of its digits is 188160, while the sum is 42.

The square root of 72287538 is about 8502.2078309107. The cubic root of 72287538 is about 416.5698282331.

The spelling of 72287538 in words is "seventy-two million, two hundred eighty-seven thousand, five hundred thirty-eight".