72991546 has 16 divisors (see below), whose sum is σ = 113667840. Its totient is φ = 35115840.

The previous prime is 72991537. The next prime is 72991549. The reversal of 72991546 is 64519927.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (72991549) 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 7 ways as a sum of consecutive naturals, for example, 7810 + ... + 14386.

It is an arithmetic number, because the mean of its divisors is an integer number (7104240).

Almost surely, 2^72991546 is an apocalyptic number.

72991546 is a deficient number, since it is larger than the sum of its proper divisors (40676294).

72991546 is a wasteful number, since it uses less digits than its factorization.

72991546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6789.

The product of its digits is 136080, while the sum is 43.

The square root of 72991546 is about 8543.5089980640. The cubic root of 72991546 is about 417.9177856210.

It can be divided in two parts, 72991 and 546, that added together give a palindrome (73537).

The spelling of 72991546 in words is "seventy-two million, nine hundred ninety-one thousand, five hundred forty-six".