63217998 has 24 divisors (see below), whose sum is σ = 140159448. Its totient is φ = 20582352.

The previous prime is 63217993. The next prime is 63218003. The reversal of 63217998 is 89971236.

63217998 is a `hidden beast` number, since 632 + 1 + 7 + 9 + 9 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (63217993) and next prime (63218003).

It is a super-2 number, since 2×63217998² = 7993030542256008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63217991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40065 + ... + 41612.

It is an arithmetic number, because the mean of its divisors is an integer number (5839977).

Almost surely, 2^63217998 is an apocalyptic number.

63217998 is an abundant number, since it is smaller than the sum of its proper divisors (76941450).

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

63217998 is a wasteful number, since it uses less digits than its factorization.

63217998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81728 (or 81725 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 63217998 is about 7950.9746572354. The cubic root of 63217998 is about 398.3641482593.

The spelling of 63217998 in words is "sixty-three million, two hundred seventeen thousand, nine hundred ninety-eight".