72143637 has 32 divisors (see below), whose sum is σ = 102524928. Its totient is φ = 45069696.

The previous prime is 72143629. The next prime is 72143671. The reversal of 72143637 is 73634127.

It is not a de Polignac number, because 72143637 - 2³ = 72143629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72143598 and 72143607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72143537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442518 + ... + 442680.

It is an arithmetic number, because the mean of its divisors is an integer number (3203904).

Almost surely, 2^72143637 is an apocalyptic number.

It is an amenable number.

72143637 is a deficient number, since it is larger than the sum of its proper divisors (30381291).

72143637 is a wasteful number, since it uses less digits than its factorization.

72143637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329.

The product of its digits is 21168, while the sum is 33.

The square root of 72143637 is about 8493.7410485604. The cubic root of 72143637 is about 416.2932262191.

The spelling of 72143637 in words is "seventy-two million, one hundred forty-three thousand, six hundred thirty-seven".