642861333 has 32 divisors (see below), whose sum is σ = 1004400000. Its totient is φ = 405254016.

The previous prime is 642861313. The next prime is 642861337. The reversal of 642861333 is 333168246.

642861333 is a `hidden beast` number, since 6 + 4 + 2 + 8 + 613 + 33 = 666.

It is not a de Polignac number, because 642861333 - 2⁵ = 642861301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642861337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 414243 + ... + 415791.

It is an arithmetic number, because the mean of its divisors is an integer number (31387500).

Almost surely, 2^642861333 is an apocalyptic number.

It is an amenable number.

642861333 is a deficient number, since it is larger than the sum of its proper divisors (361538667).

642861333 is a wasteful number, since it uses less digits than its factorization.

642861333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386 (or 2380 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 642861333 is about 25354.7102724523. The cubic root of 642861333 is about 863.0562491226.

The spelling of 642861333 in words is "six hundred forty-two million, eight hundred sixty-one thousand, three hundred thirty-three".