72286538 has 4 divisors (see below), whose sum is σ = 108429810. Its totient is φ = 36143268.

The previous prime is 72286537. The next prime is 72286549. The reversal of 72286538 is 83568227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42289009 + 29997529 = 6503^2 + 5477^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72286495 and 72286504.

It is not an unprimeable number, because it can be changed into a prime (72286537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18071633 + ... + 18071636.

Almost surely, 2^72286538 is an apocalyptic number.

72286538 is a deficient number, since it is larger than the sum of its proper divisors (36143272).

72286538 is a wasteful number, since it uses less digits than its factorization.

72286538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36143271.

The product of its digits is 161280, while the sum is 41.

The square root of 72286538 is about 8502.1490224531. The cubic root of 72286538 is about 416.5679073315.

The spelling of 72286538 in words is "seventy-two million, two hundred eighty-six thousand, five hundred thirty-eight".