66057400 has 24 divisors (see below), whose sum is σ = 153583920. Its totient is φ = 26422880.

The previous prime is 66057391. The next prime is 66057421. The reversal of 66057400 is 475066.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164944 + ... + 165343.

It is an arithmetic number, because the mean of its divisors is an integer number (6399330).

Almost surely, 2^66057400 is an apocalyptic number.

It is an amenable number.

66057400 is an abundant number, since it is smaller than the sum of its proper divisors (87526520).

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

66057400 is a wasteful number, since it uses less digits than its factorization.

66057400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330303 (or 330294 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 66057400 is about 8127.5703626607. The cubic root of 66057400 is about 404.2411232555.

The spelling of 66057400 in words is "sixty-six million, fifty-seven thousand, four hundred".