66888380 has 24 divisors (see below), whose sum is σ = 151271232. Its totient is φ = 24697152.

The previous prime is 66888377. The next prime is 66888407. The reversal of 66888380 is 8388866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128372 + ... + 128891.

It is an arithmetic number, because the mean of its divisors is an integer number (6302968).

Almost surely, 2^66888380 is an apocalyptic number.

It is an amenable number.

66888380 is an abundant number, since it is smaller than the sum of its proper divisors (84382852).

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

66888380 is a wasteful number, since it uses less digits than its factorization.

66888380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257285 (or 257283 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 47.

The square root of 66888380 is about 8178.5316530536. The cubic root of 66888380 is about 405.9291374137.

The spelling of 66888380 in words is "sixty-six million, eight hundred eighty-eight thousand, three hundred eighty".