642585783 has 16 divisors (see below), whose sum is σ = 981774080. Its totient is φ = 366218496.

The previous prime is 642585781. The next prime is 642585787. The reversal of 642585783 is 387585246.

642585783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642585783 - 2¹ = 642585781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642585781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32410 + ... + 48327.

It is an arithmetic number, because the mean of its divisors is an integer number (61360880).

Almost surely, 2^642585783 is an apocalyptic number.

642585783 is a deficient number, since it is larger than the sum of its proper divisors (339188297).

642585783 is a wasteful number, since it uses less digits than its factorization.

642585783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81126.

The product of its digits is 1612800, while the sum is 48.

The square root of 642585783 is about 25349.2757884717. The cubic root of 642585783 is about 862.9329207449.

The spelling of 642585783 in words is "six hundred forty-two million, five hundred eighty-five thousand, seven hundred eighty-three".