64743520 has 48 divisors (see below), whose sum is σ = 153906480. Its totient is φ = 25736704.

The previous prime is 64743517. The next prime is 64743521. The reversal of 64743520 is 2534746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64743521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26511 + ... + 28849.

It is an arithmetic number, because the mean of its divisors is an integer number (3206385).

Almost surely, 2^64743520 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 64743520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76953240).

64743520 is an abundant number, since it is smaller than the sum of its proper divisors (89162960).

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

64743520 is a wasteful number, since it uses less digits than its factorization.

64743520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527 (or 2519 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 64743520 is about 8046.3358120327. The cubic root of 64743520 is about 401.5430399155.

The spelling of 64743520 in words is "sixty-four million, seven hundred forty-three thousand, five hundred twenty".