66754220 has 48 divisors (see below), whose sum is σ = 158924640. Its totient is φ = 23348736.

The previous prime is 66754217. The next prime is 66754229. The reversal of 66754220 is 2245766.

It is a super-2 number, since 2×66754220² = 8912251775616800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66754229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1817 + ... + 11696.

It is an arithmetic number, because the mean of its divisors is an integer number (3310930).

Almost surely, 2^66754220 is an apocalyptic number.

It is an amenable number.

66754220 is an abundant number, since it is smaller than the sum of its proper divisors (92170420).

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

66754220 is a wasteful number, since it uses less digits than its factorization.

66754220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13554 (or 13552 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 66754220 is about 8170.3255749083. The cubic root of 66754220 is about 405.6575610750.

Adding to 66754220 its reverse (2245766), we get a palindrome (68999986).

The spelling of 66754220 in words is "sixty-six million, seven hundred fifty-four thousand, two hundred twenty".