642454868 has 24 divisors (see below), whose sum is σ = 1234640064. Its totient is φ = 290088000.

The previous prime is 642454859. The next prime is 642454907. The reversal of 642454868 is 868454246.

It is a super-4 number, since 4×642454868⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41705 + ... + 54992.

It is an arithmetic number, because the mean of its divisors is an integer number (51443336).

Almost surely, 2^642454868 is an apocalyptic number.

It is an amenable number.

642454868 is a deficient number, since it is larger than the sum of its proper divisors (592185196).

642454868 is a wasteful number, since it uses less digits than its factorization.

642454868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96863 (or 96861 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 47.

The square root of 642454868 is about 25346.6934332666. The cubic root of 642454868 is about 862.8743145432.

The spelling of 642454868 in words is "six hundred forty-two million, four hundred fifty-four thousand, eight hundred sixty-eight".