63780749406 has 128 divisors (see below), whose sum is σ = 162494323200. Its totient is φ = 18367534080.

The previous prime is 63780749341. The next prime is 63780749407. The reversal of 63780749406 is 60494708736.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63780749407) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 911310 + ... + 978798.

It is an arithmetic number, because the mean of its divisors is an integer number (1269486900).

Almost surely, 2^63780749406 is an apocalyptic number.

63780749406 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 63780749406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81247161600).

63780749406 is an abundant number, since it is smaller than the sum of its proper divisors (98713573794).

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

63780749406 is a wasteful number, since it uses less digits than its factorization.

63780749406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67591 (or 67585 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 54.

The spelling of 63780749406 in words is "sixty-three billion, seven hundred eighty million, seven hundred forty-nine thousand, four hundred six".