75691657 has 4 divisors (see below), whose sum is σ = 75711636. Its totient is φ = 75671680.

The previous prime is 75691613. The next prime is 75691661. The reversal of 75691657 is 75619657.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42237001 + 33454656 = 6499^2 + 5784^2 .

It is a cyclic number.

It is not a de Polignac number, because 75691657 - 2¹⁵ = 75658889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75691697) 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, 2368 + ... + 12529.

It is an arithmetic number, because the mean of its divisors is an integer number (18927909).

Almost surely, 2^75691657 is an apocalyptic number.

It is an amenable number.

75691657 is a deficient number, since it is larger than the sum of its proper divisors (19979).

75691657 is a wasteful number, since it uses less digits than its factorization.

75691657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19978.

The product of its digits is 396900, while the sum is 46.

The square root of 75691657 is about 8700.0952293639. The cubic root of 75691657 is about 423.0087369909.

The spelling of 75691657 in words is "seventy-five million, six hundred ninety-one thousand, six hundred fifty-seven".