72726785 has 4 divisors (see below), whose sum is σ = 87272148. Its totient is φ = 58181424.

The previous prime is 72726781. The next prime is 72726821. The reversal of 72726785 is 58762727.

It is a happy number.

It is a Cunningham number, because it is equal to 8528²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26173456 + 46553329 = 5116^2 + 6823^2 .

It is a cyclic number.

It is not a de Polignac number, because 72726785 - 2² = 72726781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72726781) 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, 7272674 + ... + 7272683.

It is an arithmetic number, because the mean of its divisors is an integer number (21818037).

Almost surely, 2^72726785 is an apocalyptic number.

It is an amenable number.

72726785 is a deficient number, since it is larger than the sum of its proper divisors (14545363).

72726785 is a wasteful number, since it uses less digits than its factorization.

72726785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14545362.

The product of its digits is 329280, while the sum is 44.

The square root of 72726785 is about 8528.0000586304. Note that the first 4 decimals coincide. The cubic root of 72726785 is about 417.4118713910.

The spelling of 72726785 in words is "seventy-two million, seven hundred twenty-six thousand, seven hundred eighty-five".