64272240 has 240 divisors, whose sum is σ = 235029600. Its totient is φ = 15679488.

The previous prime is 64272233. The next prime is 64272311. The reversal of 64272240 is 4227246.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 722116 + ... + 722204.

It is an arithmetic number, because the mean of its divisors is an integer number (979290).

Almost surely, 2^64272240 is an apocalyptic number.

64272240 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 64272240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117514800).

64272240 is an abundant number, since it is smaller than the sum of its proper divisors (170757360).

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

64272240 is a wasteful number, since it uses less digits than its factorization.

64272240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 64272240 is about 8016.9969439934. The cubic root of 64272240 is about 400.5663643667.

Adding to 64272240 its reverse (4227246), we get a palindrome (68499486).

The spelling of 64272240 in words is "sixty-four million, two hundred seventy-two thousand, two hundred forty".