32720813 has 2 divisors, whose sum is σ = 32720814. Its totient is φ = 32720812.

The previous prime is 32720803. The next prime is 32720833. The reversal of 32720813 is 31802723.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28111204 + 4609609 = 5302^2 + 2147^2 .

It is an emirp because it is prime and its reverse (31802723) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 32720813 - 2⁴ = 32720797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32720803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16360406 + 16360407.

It is an arithmetic number, because the mean of its divisors is an integer number (16360407).

Almost surely, 2^32720813 is an apocalyptic number.

It is an amenable number.

32720813 is a deficient number, since it is larger than the sum of its proper divisors (1).

32720813 is an equidigital number, since it uses as much as digits as its factorization.

32720813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 32720813 is about 5720.2109226846. The cubic root of 32720813 is about 319.8463226940.

It can be divided in two parts, 32720 and 813, that added together give a palindrome (33533).

The spelling of 32720813 in words is "thirty-two million, seven hundred twenty thousand, eight hundred thirteen".