72781514 has 16 divisors (see below), whose sum is σ = 123758880. Its totient is φ = 31823280.

The previous prime is 72781481. The next prime is 72781517. The reversal of 72781514 is 41518727.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72781517) 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, 73172 + ... + 74159.

It is an arithmetic number, because the mean of its divisors is an integer number (7734930).

Almost surely, 2^72781514 is an apocalyptic number.

72781514 is a deficient number, since it is larger than the sum of its proper divisors (50977366).

72781514 is a wasteful number, since it uses less digits than its factorization.

72781514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147365.

The product of its digits is 15680, while the sum is 35.

The square root of 72781514 is about 8531.2082379930. The cubic root of 72781514 is about 417.5165499553.

The spelling of 72781514 in words is "seventy-two million, seven hundred eighty-one thousand, five hundred fourteen".