64144560 has 80 divisors (see below), whose sum is σ = 199853280. Its totient is φ = 17018880.

The previous prime is 64144559. The next prime is 64144573. The reversal of 64144560 is 6544146.

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

It is a super-2 number, since 2×64144560² = 8229049155187200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57286 + ... + 58394.

It is an arithmetic number, because the mean of its divisors is an integer number (2498166).

Almost surely, 2^64144560 is an apocalyptic number.

64144560 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 64144560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99926640).

64144560 is an abundant number, since it is smaller than the sum of its proper divisors (135708720).

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

64144560 is a wasteful number, since it uses less digits than its factorization.

64144560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366 (or 1360 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 64144560 is about 8009.0299038023. The cubic root of 64144560 is about 400.3009401974.

The spelling of 64144560 in words is "sixty-four million, one hundred forty-four thousand, five hundred sixty".