63891940 has 48 divisors (see below), whose sum is σ = 157094784. Its totient is φ = 21369600.

The previous prime is 63891931. The next prime is 63891991. The reversal of 63891940 is 4919836.

It is a junction number, because it is equal to n+sod(n) for n = 63891893 and 63891902.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175 + ... + 11305.

It is an arithmetic number, because the mean of its divisors is an integer number (3272808).

Almost surely, 2^63891940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63891940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78547392).

63891940 is an abundant number, since it is smaller than the sum of its proper divisors (93202844).

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

63891940 is a wasteful number, since it uses less digits than its factorization.

63891940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11188 (or 11186 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 63891940 is about 7993.2433967695. The cubic root of 63891940 is about 399.7747481779.

The spelling of 63891940 in words is "sixty-three million, eight hundred ninety-one thousand, nine hundred forty".