75780057 has 4 divisors (see below), whose sum is σ = 101040080. Its totient is φ = 50520036.

The previous prime is 75780053. The next prime is 75780071. The reversal of 75780057 is 75008757.

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 not a de Polignac number, because 75780057 - 2² = 75780053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75779997 and 75780024.

It is not an unprimeable number, because it can be changed into a prime (75780053) 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, 12630007 + ... + 12630012.

It is an arithmetic number, because the mean of its divisors is an integer number (25260020).

Almost surely, 2^75780057 is an apocalyptic number.

It is an amenable number.

75780057 is a deficient number, since it is larger than the sum of its proper divisors (25260023).

75780057 is a wasteful number, since it uses less digits than its factorization.

75780057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25260022.

The product of its (nonzero) digits is 68600, while the sum is 39.

The square root of 75780057 is about 8705.1741510437. The cubic root of 75780057 is about 423.1733496921.

The spelling of 75780057 in words is "seventy-five million, seven hundred eighty thousand, fifty-seven".