64872720 has 120 divisors (see below), whose sum is σ = 237699072. Its totient is φ = 15724800.

The previous prime is 64872713. The next prime is 64872721. The reversal of 64872720 is 2727846.

64872720 is a `hidden beast` number, since 648 + 7 + 2 + 7 + 2 + 0 = 666.

64872720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (64872721) 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 23 ways as a sum of consecutive naturals, for example, 3825 + ... + 12015.

Almost surely, 2^64872720 is an apocalyptic number.

64872720 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 64872720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118849536).

64872720 is an abundant number, since it is smaller than the sum of its proper divisors (172826352).

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

64872720 is a wasteful number, since it uses less digits than its factorization.

64872720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8221 (or 8212 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 64872720 is about 8054.3603097949. The cubic root of 64872720 is about 401.8099643861.

The spelling of 64872720 in words is "sixty-four million, eight hundred seventy-two thousand, seven hundred twenty".