64688544 has 168 divisors, whose sum is σ = 198313920. Its totient is φ = 20746368.

The previous prime is 64688539. The next prime is 64688549. The reversal of 64688544 is 44588646.

It is an interprime number because it is at equal distance from previous prime (64688539) and next prime (64688549).

It is a self number, because there is not a number n which added to its sum of digits gives 64688544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64688549) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1096387 + ... + 1096445.

It is an arithmetic number, because the mean of its divisors is an integer number (1180440).

Almost surely, 2^64688544 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 64688544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99156960).

64688544 is an abundant number, since it is smaller than the sum of its proper divisors (133625376).

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

64688544 is an equidigital number, since it uses as much as digits as its factorization.

64688544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 111 counting only the distinct ones).

The product of its digits is 737280, while the sum is 45.

The square root of 64688544 is about 8042.9188731455. The cubic root of 64688544 is about 401.4293529581.

The spelling of 64688544 in words is "sixty-four million, six hundred eighty-eight thousand, five hundred forty-four".