72537638 has 16 divisors (see below), whose sum is σ = 112121280. Its totient is φ = 35177856.

The previous prime is 72537637. The next prime is 72537643. The reversal of 72537638 is 83673527.

It is a junction number, because it is equal to n+sod(n) for n = 72537595 and 72537604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72537631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7208 + ... + 14036.

It is an arithmetic number, because the mean of its divisors is an integer number (7007580).

Almost surely, 2^72537638 is an apocalyptic number.

72537638 is a deficient number, since it is larger than the sum of its proper divisors (39583642).

72537638 is a wasteful number, since it uses less digits than its factorization.

72537638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6991.

The product of its digits is 211680, while the sum is 41.

The square root of 72537638 is about 8516.9030756490. The cubic root of 72537638 is about 417.0496905324.

The spelling of 72537638 in words is "seventy-two million, five hundred thirty-seven thousand, six hundred thirty-eight".