63918340 has 24 divisors (see below), whose sum is σ = 134977752. Its totient is φ = 25424640.

The previous prime is 63918307. The next prime is 63918343. The reversal of 63918340 is 4381936.

It can be written as a sum of positive squares in 4 ways, for example, as 3452164 + 60466176 = 1858^2 + 7776^2 .

It is a junction number, because it is equal to n+sod(n) for n = 63918296 and 63918305.

It is not an unprimeable number, because it can be changed into a prime (63918343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5209 + ... + 12448.

It is an arithmetic number, because the mean of its divisors is an integer number (5624073).

Almost surely, 2^63918340 is an apocalyptic number.

It is an amenable number.

63918340 is an abundant number, since it is smaller than the sum of its proper divisors (71059412).

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

63918340 is a wasteful number, since it uses less digits than its factorization.

63918340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17847 (or 17845 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 63918340 is about 7994.8946209440. The cubic root of 63918340 is about 399.8298025924.

The spelling of 63918340 in words is "sixty-three million, nine hundred eighteen thousand, three hundred forty".