75873781 has 2 divisors, whose sum is σ = 75873782. Its totient is φ = 75873780.

The previous prime is 75873779. The next prime is 75873797. The reversal of 75873781 is 18737857.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60310756 + 15563025 = 7766^2 + 3945^2 .

It is a cyclic number.

It is not a de Polignac number, because 75873781 - 2¹ = 75873779 is a prime.

It is a super-2 number, since 2×75873781² = 11513661286471922, which contains 22 as substring.

Together with 75873779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75873731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37936890 + 37936891.

It is an arithmetic number, because the mean of its divisors is an integer number (37936891).

Almost surely, 2^75873781 is an apocalyptic number.

It is an amenable number.

75873781 is a deficient number, since it is larger than the sum of its proper divisors (1).

75873781 is an equidigital number, since it uses as much as digits as its factorization.

75873781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329280, while the sum is 46.

The square root of 75873781 is about 8710.5557227998. Note that the first 3 decimals coincide. The cubic root of 75873781 is about 423.3477366432.

The spelling of 75873781 in words is "seventy-five million, eight hundred seventy-three thousand, seven hundred eighty-one".