64159440 has 80 divisors (see below), whose sum is σ = 203552448. Its totient is φ = 16708608.

The previous prime is 64159439. The next prime is 64159441. The reversal of 64159440 is 4495146.

It is an interprime number because it is at equal distance from previous prime (64159439) and next prime (64159441).

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

It is a super-2 number, since 2×64159440² = 8232867482227200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64159441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7212 + ... + 13428.

Almost surely, 2^64159440 is an apocalyptic number.

64159440 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 64159440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101776224).

64159440 is an abundant number, since it is smaller than the sum of its proper divisors (139393008).

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

64159440 is a wasteful number, since it uses less digits than its factorization.

64159440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6276 (or 6270 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 64159440 is about 8009.9588013922. The cubic root of 64159440 is about 400.3318912111.

The spelling of 64159440 in words is "sixty-four million, one hundred fifty-nine thousand, four hundred forty".