57155807 has 8 divisors (see below), whose sum is σ = 58677696. Its totient is φ = 55646752.

The previous prime is 57155779. The next prime is 57155809. The reversal of 57155807 is 70855175.

57155807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57155807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57155809) 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 7 ways as a sum of consecutive naturals, for example, 6173 + ... + 12345.

It is an arithmetic number, because the mean of its divisors is an integer number (7334712).

Almost surely, 2^57155807 is an apocalyptic number.

57155807 is the 6173-rd pentagonal number.

57155807 is a deficient number, since it is larger than the sum of its proper divisors (1521889).

57155807 is a wasteful number, since it uses less digits than its factorization.

57155807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6417.

The product of its (nonzero) digits is 49000, while the sum is 38.

The square root of 57155807 is about 7560.1459641994. The cubic root of 57155807 is about 385.2004510785.

The spelling of 57155807 in words is "fifty-seven million, one hundred fifty-five thousand, eight hundred seven".