72161694 has 48 divisors (see below), whose sum is σ = 172658304. Its totient is φ = 21598800.

The previous prime is 72161693. The next prime is 72161701. The reversal of 72161694 is 49616127.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72161693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14239 + ... + 18629.

It is an arithmetic number, because the mean of its divisors is an integer number (3597048).

Almost surely, 2^72161694 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72161694, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86329152).

72161694 is an abundant number, since it is smaller than the sum of its proper divisors (100496610).

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

72161694 is a wasteful number, since it uses less digits than its factorization.

72161694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493 (or 4490 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 72161694 is about 8494.8039412337. The cubic root of 72161694 is about 416.3279549909.

The spelling of 72161694 in words is "seventy-two million, one hundred sixty-one thousand, six hundred ninety-four".