64685544 has 256 divisors, whose sum is σ = 223948800. Its totient is φ = 15052800.

The previous prime is 64685539. The next prime is 64685567. The reversal of 64685544 is 44558646.

It is a Harshad number since it is a multiple of its sum of digits (42).

Its product of digits (460800) is a multiple of the sum of its prime factors (144).

It is a junction number, because it is equal to n+sod(n) for n = 64685496 and 64685505.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 911029 + ... + 911099.

It is an arithmetic number, because the mean of its divisors is an integer number (874800).

Almost surely, 2^64685544 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 64685544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111974400).

64685544 is an abundant number, since it is smaller than the sum of its proper divisors (159263256).

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

64685544 is a wasteful number, since it uses less digits than its factorization.

64685544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 140 counting only the distinct ones).

The product of its digits is 460800, while the sum is 42.

The square root of 64685544 is about 8042.7323715265. The cubic root of 64685544 is about 401.4231472912.

The spelling of 64685544 in words is "sixty-four million, six hundred eighty-five thousand, five hundred forty-four".