63899840 has 28 divisors (see below), whose sum is σ = 152162256. Its totient is φ = 25559808.

The previous prime is 63899839. The next prime is 63899867. The reversal of 63899840 is 4899836.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99524 + ... + 100163.

Almost surely, 2^63899840 is an apocalyptic number.

It is an amenable number.

63899840 is an abundant number, since it is smaller than the sum of its proper divisors (88262416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63899840 is a wasteful number, since it uses less digits than its factorization.

63899840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199704 (or 199694 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 63899840 is about 7993.7375488566. The cubic root of 63899840 is about 399.7912243841.

The spelling of 63899840 in words is "sixty-three million, eight hundred ninety-nine thousand, eight hundred forty".