75724861 has 4 divisors (see below), whose sum is σ = 79710400. Its totient is φ = 71739324.

The previous prime is 75724853. The next prime is 75724877. The reversal of 75724861 is 16842757.

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 75724861 - 2³ = 75724853 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 (75724811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1992741 + ... + 1992778.

It is an arithmetic number, because the mean of its divisors is an integer number (19927600).

Almost surely, 2^75724861 is an apocalyptic number.

It is an amenable number.

75724861 is a deficient number, since it is larger than the sum of its proper divisors (3985539).

75724861 is a wasteful number, since it uses less digits than its factorization.

75724861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985538.

The product of its digits is 94080, while the sum is 40.

The square root of 75724861 is about 8702.0032751086. The cubic root of 75724861 is about 423.0705823309.

The spelling of 75724861 in words is "seventy-five million, seven hundred twenty-four thousand, eight hundred sixty-one".