72780835 has 4 divisors (see below), whose sum is σ = 87337008. Its totient is φ = 58224664.

The previous prime is 72780833. The next prime is 72780853. The reversal of 72780835 is 53808727.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72780835 - 2¹ = 72780833 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72780833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7278079 + ... + 7278088.

It is an arithmetic number, because the mean of its divisors is an integer number (21834252).

Almost surely, 2^72780835 is an apocalyptic number.

72780835 is a deficient number, since it is larger than the sum of its proper divisors (14556173).

72780835 is a wasteful number, since it uses less digits than its factorization.

72780835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14556172.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 72780835 is about 8531.1684428336. The cubic root of 72780835 is about 417.5152515733.

The spelling of 72780835 in words is "seventy-two million, seven hundred eighty thousand, eight hundred thirty-five".