642853057 has 16 divisors (see below), whose sum is σ = 802179072. Its totient is φ = 500487120.

The previous prime is 642853019. The next prime is 642853061. The reversal of 642853057 is 750358246.

It is not a de Polignac number, because 642853057 - 2¹⁵ = 642820289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642853097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106638 + ... + 112504.

It is an arithmetic number, because the mean of its divisors is an integer number (50136192).

Almost surely, 2^642853057 is an apocalyptic number.

It is an amenable number.

642853057 is a deficient number, since it is larger than the sum of its proper divisors (159326015).

642853057 is a wasteful number, since it uses less digits than its factorization.

642853057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7308.

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 642853057 is about 25354.5470675380. The cubic root of 642853057 is about 863.0525455327.

The spelling of 642853057 in words is "six hundred forty-two million, eight hundred fifty-three thousand, fifty-seven".