72161406 has 12 divisors (see below), whose sum is σ = 156349752. Its totient is φ = 24053796.

The previous prime is 72161387. The next prime is 72161423. The reversal of 72161406 is 60416127.

It is a self number, because there is not a number n which added to its sum of digits gives 72161406.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2004466 + ... + 2004501.

It is an arithmetic number, because the mean of its divisors is an integer number (13029146).

Almost surely, 2^72161406 is an apocalyptic number.

72161406 is an abundant number, since it is smaller than the sum of its proper divisors (84188346).

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

72161406 is a wasteful number, since it uses less digits than its factorization.

72161406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008975 (or 4008972 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 72161406 is about 8494.7869896778. The cubic root of 72161406 is about 416.3274011301.

The spelling of 72161406 in words is "seventy-two million, one hundred sixty-one thousand, four hundred six".