75639973 has 2 divisors, whose sum is σ = 75639974. Its totient is φ = 75639972.

The previous prime is 75639959. The next prime is 75639989. The reversal of 75639973 is 37993657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67125249 + 8514724 = 8193^2 + 2918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75639973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75639173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37819986 + 37819987.

It is an arithmetic number, because the mean of its divisors is an integer number (37819987).

Almost surely, 2^75639973 is an apocalyptic number.

It is an amenable number.

75639973 is a deficient number, since it is larger than the sum of its proper divisors (1).

75639973 is an equidigital number, since it uses as much as digits as its factorization.

75639973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1071630, while the sum is 49.

The square root of 75639973 is about 8697.1244098265. The cubic root of 75639973 is about 422.9124350449.

The spelling of 75639973 in words is "seventy-five million, six hundred thirty-nine thousand, nine hundred seventy-three".