63865780 has 48 divisors (see below), whose sum is σ = 148740480. Its totient is φ = 22838400.

The previous prime is 63865727. The next prime is 63865799. The reversal of 63865780 is 8756836.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 11041 + ... + 15799.

It is an arithmetic number, because the mean of its divisors is an integer number (3098760).

Almost surely, 2^63865780 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 63865780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74370240).

63865780 is an abundant number, since it is smaller than the sum of its proper divisors (84874700).

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

63865780 is a wasteful number, since it uses less digits than its factorization.

63865780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4840 (or 4838 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 63865780 is about 7991.6068471866. The cubic root of 63865780 is about 399.7201792966.

The spelling of 63865780 in words is "sixty-three million, eight hundred sixty-five thousand, seven hundred eighty".