642404085 has 16 divisors (see below), whose sum is σ = 1063290240. Its totient is φ = 330800960.

The previous prime is 642404083. The next prime is 642404123. The reversal of 642404085 is 580404246.

It is not a de Polignac number, because 642404085 - 2¹ = 642404083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642404083) 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, 737961 + ... + 738830.

It is an arithmetic number, because the mean of its divisors is an integer number (66455640).

Almost surely, 2^642404085 is an apocalyptic number.

It is an amenable number.

642404085 is a deficient number, since it is larger than the sum of its proper divisors (420886155).

642404085 is a wasteful number, since it uses less digits than its factorization.

642404085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476828.

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 642404085 is about 25345.6916457216. The cubic root of 642404085 is about 862.8515785747.

The spelling of 642404085 in words is "six hundred forty-two million, four hundred four thousand, eighty-five".