63402640 has 80 divisors (see below), whose sum is σ = 172453248. Its totient is φ = 21224448.

The previous prime is 63402611. The next prime is 63402643. The reversal of 63402640 is 4620436.

63402640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (63402643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22764 + ... + 25396.

Almost surely, 2^63402640 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 63402640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86226624).

63402640 is an abundant number, since it is smaller than the sum of its proper divisors (109050608).

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

63402640 is a wasteful number, since it uses less digits than its factorization.

63402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2696 (or 2690 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 63402640 is about 7962.5774721506. The cubic root of 63402640 is about 398.7516078459.

The spelling of 63402640 in words is "sixty-three million, four hundred two thousand, six hundred forty".