66523680 has 288 divisors, whose sum is σ = 247665600. Its totient is φ = 16837632.

The previous prime is 66523657. The next prime is 66523687. The reversal of 66523680 is 8632566.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66523687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1127491 + ... + 1127549.

It is an arithmetic number, because the mean of its divisors is an integer number (859950).

Almost surely, 2^66523680 is an apocalyptic number.

66523680 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 66523680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123832800).

66523680 is an abundant number, since it is smaller than the sum of its proper divisors (181141920).

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

66523680 is a wasteful number, since it uses less digits than its factorization.

66523680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 66523680 is about 8156.2049998759. The cubic root of 66523680 is about 405.1900342749.

The spelling of 66523680 in words is "sixty-six million, five hundred twenty-three thousand, six hundred eighty".