64278720 has 168 divisors, whose sum is σ = 241310160. Its totient is φ = 15575040.

The previous prime is 64278719. The next prime is 64278733. The reversal of 64278720 is 2787246.

64278720 is a `hidden beast` number, since 642 + 7 + 8 + 7 + 2 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 30666 + ... + 32694.

It is an arithmetic number, because the mean of its divisors is an integer number (1436370).

Almost surely, 2^64278720 is an apocalyptic number.

64278720 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 64278720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120655080).

64278720 is an abundant number, since it is smaller than the sum of its proper divisors (177031440).

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

64278720 is a wasteful number, since it uses less digits than its factorization.

64278720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063 (or 2050 counting only the distinct ones).

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

The square root of 64278720 is about 8017.4010751615. The cubic root of 64278720 is about 400.5798257658.

It can be divided in two parts, 64 and 278720, that added together give a square (278784 = 528²).

The spelling of 64278720 in words is "sixty-four million, two hundred seventy-eight thousand, seven hundred twenty".