72891646 has 16 divisors (see below), whose sum is σ = 114829344. Its totient is φ = 34635744.

The previous prime is 72891629. The next prime is 72891673. The reversal of 72891646 is 64619827.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2176 + ... + 12268.

It is an arithmetic number, because the mean of its divisors is an integer number (7176834).

Almost surely, 2^72891646 is an apocalyptic number.

72891646 is a deficient number, since it is larger than the sum of its proper divisors (41937698).

72891646 is a wasteful number, since it uses less digits than its factorization.

72891646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10275.

The product of its digits is 145152, while the sum is 43.

The square root of 72891646 is about 8537.6604523722. The cubic root of 72891646 is about 417.7270372826.

It can be divided in two parts, 72891 and 646, that added together give a palindrome (73537).

The spelling of 72891646 in words is "seventy-two million, eight hundred ninety-one thousand, six hundred forty-six".