63442809 has 24 divisors (see below), whose sum is σ = 97673472. Its totient is φ = 39589440.

The previous prime is 63442787. The next prime is 63442811. The reversal of 63442809 is 90824436.

It is a happy number.

It is not a de Polignac number, because 63442809 - 2⁵ = 63442777 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (63442889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6469 + ... + 12989.

It is an arithmetic number, because the mean of its divisors is an integer number (4069728).

Almost surely, 2^63442809 is an apocalyptic number.

63442809 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

63442809 is a deficient number, since it is larger than the sum of its proper divisors (34230663).

63442809 is a wasteful number, since it uses less digits than its factorization.

63442809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6597 (or 6594 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 63442809 is about 7965.0994344076. The cubic root of 63442809 is about 398.8358003016.

The spelling of 63442809 in words is "sixty-three million, four hundred forty-two thousand, eight hundred nine".