75747561 has 4 divisors (see below), whose sum is σ = 100996752. Its totient is φ = 50498372.

The previous prime is 75747527. The next prime is 75747569. The reversal of 75747561 is 16574757.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16574757 = 3 ⋅5524919.

It is a cyclic number.

It is not a de Polignac number, because 75747561 - 2¹⁰ = 75746537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75747569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12624591 + ... + 12624596.

It is an arithmetic number, because the mean of its divisors is an integer number (25249188).

Almost surely, 2^75747561 is an apocalyptic number.

It is an amenable number.

75747561 is a deficient number, since it is larger than the sum of its proper divisors (25249191).

75747561 is a wasteful number, since it uses less digits than its factorization.

75747561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25249190.

The product of its digits is 205800, while the sum is 42.

The square root of 75747561 is about 8703.3074747477. The cubic root of 75747561 is about 423.1128526528.

It can be divided in two parts, 7574756 and 1, that added together give a palindrome (7574757).

The spelling of 75747561 in words is "seventy-five million, seven hundred forty-seven thousand, five hundred sixty-one".