669040644 has 48 divisors (see below), whose sum is σ = 1655047296. Its totient is φ = 209625600.

The previous prime is 669040639. The next prime is 669040681. The reversal of 669040644 is 446040966.

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, 208734 + ... + 211914.

It is an arithmetic number, because the mean of its divisors is an integer number (34480152).

Almost surely, 2^669040644 is an apocalyptic number.

It is an amenable number.

669040644 is an abundant number, since it is smaller than the sum of its proper divisors (986006652).

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

669040644 is a wasteful number, since it uses less digits than its factorization.

669040644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236 (or 4234 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 669040644 is about 25865.8199947344. The cubic root of 669040644 is about 874.6161664523.

The spelling of 669040644 in words is "six hundred sixty-nine million, forty thousand, six hundred forty-four".