75813813 has 14 divisors (see below), whose sum is σ = 113669814. Its totient is φ = 50542056.

The previous prime is 75813811. The next prime is 75813823. The reversal of 75813813 is 31831857.

It can be written as a sum of positive squares in only one way, i.e., 59629284 + 16184529 = 7722^2 + 4023^2 .

It is not a de Polignac number, because 75813813 - 2¹ = 75813811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75813811) 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 13 ways as a sum of consecutive naturals, for example, 51270 + ... + 52727.

Almost surely, 2^75813813 is an apocalyptic number.

It is an amenable number.

75813813 is a deficient number, since it is larger than the sum of its proper divisors (37856001).

75813813 is an equidigital number, since it uses as much as digits as its factorization.

75813813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104015 (or 104000 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 75813813 is about 8707.1127820880. The cubic root of 75813813 is about 423.2361741329.

The spelling of 75813813 in words is "seventy-five million, eight hundred thirteen thousand, eight hundred thirteen".