57781536578 has 8 divisors (see below), whose sum is σ = 87054121872. Its totient is φ = 28763495956.

The previous prime is 57781536541. The next prime is 57781536581. The reversal of 57781536578 is 87563518775.

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

It is a self number, because there is not a number n which added to its sum of digits gives 57781536578.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63635600 + ... + 63636507.

It is an arithmetic number, because the mean of its divisors is an integer number (10881765234).

Almost surely, 2^57781536578 is an apocalyptic number.

57781536578 is a deficient number, since it is larger than the sum of its proper divisors (29272585294).

57781536578 is a wasteful number, since it uses less digits than its factorization.

57781536578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127272336.

The product of its digits is 49392000, while the sum is 62.

The spelling of 57781536578 in words is "fifty-seven billion, seven hundred eighty-one million, five hundred thirty-six thousand, five hundred seventy-eight".