57639905 has 8 divisors (see below), whose sum is σ = 69633000. Its totient is φ = 45801856.

The previous prime is 57639893. The next prime is 57639917. The reversal of 57639905 is 50993675.

It is an interprime number because it is at equal distance from previous prime (57639893) and next prime (57639917).

It can be written as a sum of positive squares in 4 ways, for example, as 3411409 + 54228496 = 1847^2 + 7364^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 57639905 - 2⁸ = 57639649 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37940 + ... + 39429.

It is an arithmetic number, because the mean of its divisors is an integer number (8704125).

Almost surely, 2^57639905 is an apocalyptic number.

It is an amenable number.

57639905 is a deficient number, since it is larger than the sum of its proper divisors (11993095).

57639905 is a wasteful number, since it uses less digits than its factorization.

57639905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77523.

The product of its (nonzero) digits is 255150, while the sum is 44.

The square root of 57639905 is about 7592.0949019358. The cubic root of 57639905 is about 386.2849181015.

The spelling of 57639905 in words is "fifty-seven million, six hundred thirty-nine thousand, nine hundred five".