66488380 has 24 divisors (see below), whose sum is σ = 159572448. Its totient is φ = 22795968.

The previous prime is 66488351. The next prime is 66488381. The reversal of 66488380 is 8388466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66488381) 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, 237319 + ... + 237598.

It is an arithmetic number, because the mean of its divisors is an integer number (6648852).

Almost surely, 2^66488380 is an apocalyptic number.

It is an amenable number.

66488380 is an abundant number, since it is smaller than the sum of its proper divisors (93084068).

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

66488380 is a wasteful number, since it uses less digits than its factorization.

66488380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474933 (or 474931 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 66488380 is about 8154.0407161112. The cubic root of 66488380 is about 405.1183518359.

The spelling of 66488380 in words is "sixty-six million, four hundred eighty-eight thousand, three hundred eighty".