72161637 has 8 divisors (see below), whose sum is σ = 96272640. Its totient is φ = 48079200.

The previous prime is 72161633. The next prime is 72161659. The reversal of 72161637 is 73616127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72161637 - 2² = 72161633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72161598 and 72161607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72161633) 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, 312 + ... + 12017.

It is an arithmetic number, because the mean of its divisors is an integer number (12034080).

Almost surely, 2^72161637 is an apocalyptic number.

It is an amenable number.

72161637 is a deficient number, since it is larger than the sum of its proper divisors (24111003).

72161637 is a wasteful number, since it uses less digits than its factorization.

72161637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14283.

The product of its digits is 10584, while the sum is 33.

The square root of 72161637 is about 8494.8005862410. The cubic root of 72161637 is about 416.3278453728.

The spelling of 72161637 in words is "seventy-two million, one hundred sixty-one thousand, six hundred thirty-seven".