72194631 has 16 divisors (see below), whose sum is σ = 106354944. Its totient is φ = 43328384.

The previous prime is 72194627. The next prime is 72194663. The reversal of 72194631 is 13649127.

It is a cyclic number.

It is not a de Polignac number, because 72194631 - 2² = 72194627 is a prime.

It is a super-2 number, since 2×72194631² = 10424129490452322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72194592 and 72194601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72194621) 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 15 ways as a sum of consecutive naturals, for example, 29601 + ... + 31946.

It is an arithmetic number, because the mean of its divisors is an integer number (6647184).

Almost surely, 2^72194631 is an apocalyptic number.

72194631 is a deficient number, since it is larger than the sum of its proper divisors (34160313).

72194631 is a wasteful number, since it uses less digits than its factorization.

72194631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61590.

The product of its digits is 9072, while the sum is 33.

The square root of 72194631 is about 8496.7423757579. The cubic root of 72194631 is about 416.3912873368.

The spelling of 72194631 in words is "seventy-two million, one hundred ninety-four thousand, six hundred thirty-one".