63645340 has 24 divisors (see below), whose sum is σ = 145806192. Its totient is φ = 23143680.

The previous prime is 63645319. The next prime is 63645353. The reversal of 63645340 is 4354636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144429 + ... + 144868.

It is an arithmetic number, because the mean of its divisors is an integer number (6075258).

Almost surely, 2^63645340 is an apocalyptic number.

It is an amenable number.

63645340 is an abundant number, since it is smaller than the sum of its proper divisors (82160852).

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

63645340 is a wasteful number, since it uses less digits than its factorization.

63645340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289317 (or 289315 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 63645340 is about 7977.8029557015. The cubic root of 63645340 is about 399.2597559419.

Adding to 63645340 its reverse (4354636), we get a palindrome (67999976).

The spelling of 63645340 in words is "sixty-three million, six hundred forty-five thousand, three hundred forty".