64721160 has 192 divisors, whose sum is σ = 251164800. Its totient is φ = 14781312.

The previous prime is 64721147. The next prime is 64721161. The reversal of 64721160 is 6112746.

64721160 is a `hidden beast` number, since 647 + 2 + 1 + 16 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (64721161) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52309 + ... + 53531.

It is an arithmetic number, because the mean of its divisors is an integer number (1308150).

Almost surely, 2^64721160 is an apocalyptic number.

64721160 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 64721160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125582400).

64721160 is an abundant number, since it is smaller than the sum of its proper divisors (186443640).

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

64721160 is a wasteful number, since it uses less digits than its factorization.

64721160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257 (or 1240 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 64721160 is about 8044.9462397209. The cubic root of 64721160 is about 401.4968085903.

The spelling of 64721160 in words is "sixty-four million, seven hundred twenty-one thousand, one hundred sixty".