66889400 has 24 divisors (see below), whose sum is σ = 155518320. Its totient is φ = 26755680.

The previous prime is 66889397. The next prime is 66889423. The reversal of 66889400 is 498866.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 167024 + ... + 167423.

It is an arithmetic number, because the mean of its divisors is an integer number (6479930).

Almost surely, 2^66889400 is an apocalyptic number.

It is an amenable number.

66889400 is an abundant number, since it is smaller than the sum of its proper divisors (88628920).

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

66889400 is a wasteful number, since it uses less digits than its factorization.

66889400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334463 (or 334454 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 66889400 is about 8178.5940111978. The cubic root of 66889400 is about 405.9312007796.

The spelling of 66889400 in words is "sixty-six million, eight hundred eighty-nine thousand, four hundred".