63623440 has 40 divisors (see below), whose sum is σ = 149811840. Its totient is φ = 25124736.

The previous prime is 63623423. The next prime is 63623449. The reversal of 63623440 is 4432636.

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 = 63623399 and 63623408.

It is not an unprimeable number, because it can be changed into a prime (63623449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1287 + ... + 11353.

It is an arithmetic number, because the mean of its divisors is an integer number (3745296).

Almost surely, 2^63623440 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 63623440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74905920).

63623440 is an abundant number, since it is smaller than the sum of its proper divisors (86188400).

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

63623440 is a wasteful number, since it uses less digits than its factorization.

63623440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10159 (or 10153 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 63623440 is about 7976.4302792665. The cubic root of 63623440 is about 399.2139563503.

The spelling of 63623440 in words is "sixty-three million, six hundred twenty-three thousand, four hundred forty".