57642778 has 8 divisors (see below), whose sum is σ = 89445780. Its totient is φ = 27827520.

The previous prime is 57642773. The next prime is 57642799. The reversal of 57642778 is 87724675.

It can be written as a sum of positive squares in 2 ways, for example, as 51022449 + 6620329 = 7143^2 + 2573^2 .

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

It is not an unprimeable number, because it can be changed into a prime (57642773) 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, 496863 + ... + 496978.

Almost surely, 2^57642778 is an apocalyptic number.

57642778 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

57642778 is a deficient number, since it is larger than the sum of its proper divisors (31803002).

57642778 is a wasteful number, since it uses less digits than its factorization.

57642778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993872.

The product of its digits is 658560, while the sum is 46.

The square root of 57642778 is about 7592.2841095417. The cubic root of 57642778 is about 386.2913359824.

The spelling of 57642778 in words is "fifty-seven million, six hundred forty-two thousand, seven hundred seventy-eight".