75365621 has 4 divisors (see below), whose sum is σ = 75417792. Its totient is φ = 75313452.

The previous prime is 75365617. The next prime is 75365651. The reversal of 75365621 is 12656357.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75365621 - 2² = 75365617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75365651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23855 + ... + 26828.

It is an arithmetic number, because the mean of its divisors is an integer number (18854448).

Almost surely, 2^75365621 is an apocalyptic number.

It is an amenable number.

75365621 is a deficient number, since it is larger than the sum of its proper divisors (52171).

75365621 is a wasteful number, since it uses less digits than its factorization.

75365621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52170.

The product of its digits is 37800, while the sum is 35.

The square root of 75365621 is about 8681.3375121579. The cubic root of 75365621 is about 422.4005036300.

The spelling of 75365621 in words is "seventy-five million, three hundred sixty-five thousand, six hundred twenty-one".