64070640 has 240 divisors, whose sum is σ = 231895872. Its totient is φ = 15814656.

The previous prime is 64070623. The next prime is 64070651. The reversal of 64070640 is 4607046.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 877644 + ... + 877716.

Almost surely, 2^64070640 is an apocalyptic number.

64070640 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 64070640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115947936).

64070640 is an abundant number, since it is smaller than the sum of its proper divisors (167825232).

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

64070640 is a wasteful number, since it uses less digits than its factorization.

64070640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 64070640 is about 8004.4137824078. The cubic root of 64070640 is about 400.1471125548.

Adding to 64070640 its reverse (4607046), we get a palindrome (68677686).

The spelling of 64070640 in words is "sixty-four million, seventy thousand, six hundred forty".