669441894 has 32 divisors (see below), whose sum is σ = 1468696320. Its totient is φ = 201736800.

The previous prime is 669441881. The next prime is 669441917. The reversal of 669441894 is 498144966.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16074 + ... + 39965.

It is an arithmetic number, because the mean of its divisors is an integer number (45896760).

Almost surely, 2^669441894 is an apocalyptic number.

669441894 is an abundant number, since it is smaller than the sum of its proper divisors (799254426).

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

669441894 is a wasteful number, since it uses less digits than its factorization.

669441894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56236.

The product of its digits is 1492992, while the sum is 51.

The square root of 669441894 is about 25873.5752071491. The cubic root of 669441894 is about 874.7909787530.

The spelling of 669441894 in words is "six hundred sixty-nine million, four hundred forty-one thousand, eight hundred ninety-four".