64425240 has 384 divisors, whose sum is σ = 258552000. Its totient is φ = 14192640.

The previous prime is 64425239. The next prime is 64425247. The reversal of 64425240 is 4252446.

64425240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64425240² = 8301223098115200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64425247) 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 95 ways as a sum of consecutive naturals, for example, 2221546 + ... + 2221574.

Almost surely, 2^64425240 is an apocalyptic number.

64425240 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 64425240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129276000).

64425240 is an abundant number, since it is smaller than the sum of its proper divisors (194126760).

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

64425240 is a wasteful number, since it uses less digits than its factorization.

64425240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 64425240 is about 8026.5334983416. The cubic root of 64425240 is about 400.8839617567.

Adding to 64425240 its reverse (4252446), we get a palindrome (68677686).

The spelling of 64425240 in words is "sixty-four million, four hundred twenty-five thousand, two hundred forty".