75890621 has 2 divisors, whose sum is σ = 75890622. Its totient is φ = 75890620.

The previous prime is 75890599. The next prime is 75890627. The reversal of 75890621 is 12609857.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74476900 + 1413721 = 8630^2 + 1189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75890621 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75890627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37945310 + 37945311.

It is an arithmetic number, because the mean of its divisors is an integer number (37945311).

Almost surely, 2^75890621 is an apocalyptic number.

It is an amenable number.

75890621 is a deficient number, since it is larger than the sum of its proper divisors (1).

75890621 is an equidigital number, since it uses as much as digits as its factorization.

75890621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 75890621 is about 8711.5223124320. The cubic root of 75890621 is about 423.3790546577.

The spelling of 75890621 in words is "seventy-five million, eight hundred ninety thousand, six hundred twenty-one".