75857557 has 4 divisors (see below), whose sum is σ = 79850080. Its totient is φ = 71865036.

The previous prime is 75857549. The next prime is 75857563. The reversal of 75857557 is 75575857.

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: 75575857 = 7 ⋅10796551.

It is a cyclic number.

It is not a de Polignac number, because 75857557 - 2³ = 75857549 is a prime.

It is a super-3 number, since 3×75857557³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75857557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75857057) 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, 1996233 + ... + 1996270.

It is an arithmetic number, because the mean of its divisors is an integer number (19962520).

Almost surely, 2^75857557 is an apocalyptic number.

It is an amenable number.

75857557 is a deficient number, since it is larger than the sum of its proper divisors (3992523).

75857557 is a wasteful number, since it uses less digits than its factorization.

75857557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992522.

The product of its digits is 1715000, while the sum is 49.

The square root of 75857557 is about 8709.6243891456. The cubic root of 75857557 is about 423.3175598452.

The spelling of 75857557 in words is "seventy-five million, eight hundred fifty-seven thousand, five hundred fifty-seven".