63591440 has 80 divisors (see below), whose sum is σ = 162846720. Its totient is φ = 22901760.

The previous prime is 63591433. The next prime is 63591449. The reversal of 63591440 is 4419536.

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

It is a junction number, because it is equal to n+sod(n) for n = 63591397 and 63591406.

It is not an unprimeable number, because it can be changed into a prime (63591449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111476 + ... + 112044.

It is an arithmetic number, because the mean of its divisors is an integer number (2035584).

Almost surely, 2^63591440 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 63591440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81423360).

63591440 is an abundant number, since it is smaller than the sum of its proper divisors (99255280).

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

63591440 is a wasteful number, since it uses less digits than its factorization.

63591440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 63591440 is about 7974.4241171385. The cubic root of 63591440 is about 399.1470156706.

It can be divided in two parts, 635 and 91440, that multiplied together give a square (58064400 = 7620²).

The spelling of 63591440 in words is "sixty-three million, five hundred ninety-one thousand, four hundred forty".