63957840 has 40 divisors (see below), whose sum is σ = 198270048. Its totient is φ = 17055360.

The previous prime is 63957797. The next prime is 63957841. The reversal of 63957840 is 4875936.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 63957792 and 63957801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63957841) 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, 133006 + ... + 133485.

Almost surely, 2^63957840 is an apocalyptic number.

63957840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63957840 is an abundant number, since it is smaller than the sum of its proper divisors (134312208).

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

63957840 is a wasteful number, since it uses less digits than its factorization.

63957840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266507 (or 266501 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 63957840 is about 7997.3645659054. The cubic root of 63957840 is about 399.9121473729.

The spelling of 63957840 in words is "sixty-three million, nine hundred fifty-seven thousand, eight hundred forty".