66532320 has 96 divisors (see below), whose sum is σ = 232878240. Its totient is φ = 17740800.

The previous prime is 66532289. The next prime is 66532337. The reversal of 66532320 is 2323566.

66532320 is a `hidden beast` number, since 6 + 653 + 2 + 3 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3381 + ... + 12020.

It is an arithmetic number, because the mean of its divisors is an integer number (2425815).

Almost surely, 2^66532320 is an apocalyptic number.

66532320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66532320 is an abundant number, since it is smaller than the sum of its proper divisors (166345920).

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

66532320 is a wasteful number, since it uses less digits than its factorization.

66532320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15425 (or 15411 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 66532320 is about 8156.7346407738. The cubic root of 66532320 is about 405.2075753487.

Adding to 66532320 its reverse (2323566), we get a palindrome (68855886).

The spelling of 66532320 in words is "sixty-six million, five hundred thirty-two thousand, three hundred twenty".