66140448 has 48 divisors (see below), whose sum is σ = 189405216. Its totient is φ = 20042240.

The previous prime is 66140443. The next prime is 66140461. The reversal of 66140448 is 84404166.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (66140441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30261 + ... + 32372.

It is an arithmetic number, because the mean of its divisors is an integer number (3945942).

Almost surely, 2^66140448 is an apocalyptic number.

It is an amenable number.

66140448 is an abundant number, since it is smaller than the sum of its proper divisors (123264768).

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

66140448 is a wasteful number, since it uses less digits than its factorization.

66140448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62657 (or 62649 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 66140448 is about 8132.6777877892. The cubic root of 66140448 is about 404.4104575912.

The spelling of 66140448 in words is "sixty-six million, one hundred forty thousand, four hundred forty-eight".