64563240 has 128 divisors (see below), whose sum is σ = 223845120. Its totient is φ = 14592000.

The previous prime is 64563227. The next prime is 64563241. The reversal of 64563240 is 4236546.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64563198 and 64563207.

It is not an unprimeable number, because it can be changed into a prime (64563241) 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 31 ways as a sum of consecutive naturals, for example, 84460 + ... + 85220.

It is an arithmetic number, because the mean of its divisors is an integer number (1748790).

Almost surely, 2^64563240 is an apocalyptic number.

64563240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64563240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111922560).

64563240 is an abundant number, since it is smaller than the sum of its proper divisors (159281880).

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

64563240 is a wasteful number, since it uses less digits than its factorization.

64563240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 64563240 is about 8035.1253879451. The cubic root of 64563240 is about 401.1699911319.

Adding to 64563240 its reverse (4236546), we get a palindrome (68799786).

The spelling of 64563240 in words is "sixty-four million, five hundred sixty-three thousand, two hundred forty".