75642689 has 8 divisors (see below), whose sum is σ = 77795880. Its totient is φ = 73495296.

The previous prime is 75642647. The next prime is 75642709. The reversal of 75642689 is 98624657.

It can be written as a sum of positive squares in 4 ways, for example, as 39438400 + 36204289 = 6280^2 + 6017^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75642689 - 2⁸ = 75642433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75642389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50057 + ... + 51545.

It is an arithmetic number, because the mean of its divisors is an integer number (9724485).

Almost surely, 2^75642689 is an apocalyptic number.

It is an amenable number.

75642689 is a deficient number, since it is larger than the sum of its proper divisors (2153191).

75642689 is a wasteful number, since it uses less digits than its factorization.

75642689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899.

The product of its digits is 725760, while the sum is 47.

The square root of 75642689 is about 8697.2805519887. The cubic root of 75642689 is about 422.9174968149.

The spelling of 75642689 in words is "seventy-five million, six hundred forty-two thousand, six hundred eighty-nine".