64143744 has 128 divisors (see below), whose sum is σ = 199104000. Its totient is φ = 18289152.

The previous prime is 64143731. The next prime is 64143773. The reversal of 64143744 is 44734146.

64143744 = T₄₃₂ + T₄₃₃ + ... + T₇₇₄.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×64143744² = 8228839788675072, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 131469 + ... + 131955.

It is an arithmetic number, because the mean of its divisors is an integer number (1555500).

Almost surely, 2^64143744 is an apocalyptic number.

64143744 is a gapful number since it is divisible by the number (64) 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 64143744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99552000).

64143744 is an abundant number, since it is smaller than the sum of its proper divisors (134960256).

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

64143744 is an equidigital number, since it uses as much as digits as its factorization.

64143744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 499 counting only the distinct ones).

The product of its digits is 32256, while the sum is 33.

The square root of 64143744 is about 8008.9789611411. The cubic root of 64143744 is about 400.2992427453.

The spelling of 64143744 in words is "sixty-four million, one hundred forty-three thousand, seven hundred forty-four".