64224240 has 40 divisors (see below), whose sum is σ = 199095888. Its totient is φ = 17126400.

The previous prime is 64224239. The next prime is 64224247. The reversal of 64224240 is 4242246.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 64224240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64224247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133561 + ... + 134040.

Almost surely, 2^64224240 is an apocalyptic number.

64224240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64224240 is an abundant number, since it is smaller than the sum of its proper divisors (134871648).

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

64224240 is a wasteful number, since it uses less digits than its factorization.

64224240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267617 (or 267611 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 64224240 is about 8014.0027451954. The cubic root of 64224240 is about 400.4666221145.

Adding to 64224240 its reverse (4242246), we get a palindrome (68466486).

The spelling of 64224240 in words is "sixty-four million, two hundred twenty-four thousand, two hundred forty".