66859488 has 72 divisors (see below), whose sum is σ = 192491208. Its totient is φ = 22010112.

The previous prime is 66859469. The next prime is 66859519. The reversal of 66859488 is 88495866.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×66859488² = 8940382271244288, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22506 + ... + 25302.

It is an arithmetic number, because the mean of its divisors is an integer number (2673489).

Almost surely, 2^66859488 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 66859488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96245604).

66859488 is an abundant number, since it is smaller than the sum of its proper divisors (125631720).

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

66859488 is a wasteful number, since it uses less digits than its factorization.

66859488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896 (or 2885 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The square root of 66859488 is about 8176.7651305391. The cubic root of 66859488 is about 405.8706828477.

The spelling of 66859488 in words is "sixty-six million, eight hundred fifty-nine thousand, four hundred eighty-eight".