72780811 has 8 divisors (see below), whose sum is σ = 78393920. Its totient is φ = 67345992.

The previous prime is 72780803. The next prime is 72780823. The reversal of 72780811 is 11808727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72780811 - 2³ = 72780803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72783811) 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 7 ways as a sum of consecutive naturals, for example, 43725 + ... + 45358.

It is an arithmetic number, because the mean of its divisors is an integer number (9799240).

Almost surely, 2^72780811 is an apocalyptic number.

72780811 is a deficient number, since it is larger than the sum of its proper divisors (5613109).

72780811 is a wasteful number, since it uses less digits than its factorization.

72780811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89145.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 72780811 is about 8531.1670362266. The cubic root of 72780811 is about 417.5152056804.

The spelling of 72780811 in words is "seventy-two million, seven hundred eighty thousand, eight hundred eleven".