66880394 has 48 divisors (see below), whose sum is σ = 121888800. Its totient is φ = 27419616.

The previous prime is 66880391. The next prime is 66880417. The reversal of 66880394 is 49308866.

It is a super-4 number, since 4×66880394⁴ (a number of 32 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (66880391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248492 + ... + 248760.

It is an arithmetic number, because the mean of its divisors is an integer number (2539350).

Almost surely, 2^66880394 is an apocalyptic number.

66880394 is a deficient number, since it is larger than the sum of its proper divisors (55008406).

66880394 is a wasteful number, since it uses less digits than its factorization.

66880394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 66880394 is about 8178.0434090313. The cubic root of 66880394 is about 405.9129817470.

The spelling of 66880394 in words is "sixty-six million, eight hundred eighty thousand, three hundred ninety-four".