72163634 has 16 divisors (see below), whose sum is σ = 116095680. Its totient is φ = 33536880.

The previous prime is 72163633. The next prime is 72163669. The reversal of 72163634 is 43636127.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 72163634.

It is not an unprimeable number, because it can be changed into a prime (72163631) 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, 15902 + ... + 19929.

It is an arithmetic number, because the mean of its divisors is an integer number (7255980).

Almost surely, 2^72163634 is an apocalyptic number.

72163634 is a deficient number, since it is larger than the sum of its proper divisors (43932046).

72163634 is a wasteful number, since it uses less digits than its factorization.

72163634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35905.

The product of its digits is 18144, while the sum is 32.

The square root of 72163634 is about 8494.9181279162. The cubic root of 72163634 is about 416.3316858207.

The spelling of 72163634 in words is "seventy-two million, one hundred sixty-three thousand, six hundred thirty-four".