642853449 has 32 divisors (see below), whose sum is σ = 1091767040. Its totient is φ = 366218496.

The previous prime is 642853433. The next prime is 642853481. The reversal of 642853449 is 944358246.

It is not a de Polignac number, because 642853449 - 2⁴ = 642853433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642853649) 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, 58647 + ... + 68739.

It is an arithmetic number, because the mean of its divisors is an integer number (34117720).

Almost surely, 2^642853449 is an apocalyptic number.

It is an amenable number.

642853449 is a deficient number, since it is larger than the sum of its proper divisors (448913591).

642853449 is a wasteful number, since it uses less digits than its factorization.

642853449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10446 (or 10440 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 642853449 is about 25354.5547979056. The cubic root of 642853449 is about 863.0527209572.

The spelling of 642853449 in words is "six hundred forty-two million, eight hundred fifty-three thousand, four hundred forty-nine".