64145680 has 80 divisors (see below), whose sum is σ = 158114880. Its totient is φ = 24159744.

The previous prime is 64145671. The next prime is 64145681. The reversal of 64145680 is 8654146.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×64145680² = 8229336525324800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64145681) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 99439 + ... + 100081.

It is an arithmetic number, because the mean of its divisors is an integer number (1976436).

Almost surely, 2^64145680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64145680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79057440).

64145680 is an abundant number, since it is smaller than the sum of its proper divisors (93969200).

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

64145680 is a wasteful number, since it uses less digits than its factorization.

64145680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 64145680 is about 8009.0998245745. The cubic root of 64145680 is about 400.3032700101.

The spelling of 64145680 in words is "sixty-four million, one hundred forty-five thousand, six hundred eighty".