669040636 has 24 divisors (see below), whose sum is σ = 1318464000. Its totient is φ = 294298800.

The previous prime is 669040621. The next prime is 669040639. The reversal of 669040636 is 636040966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669040639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243886 + ... + 246613.

It is an arithmetic number, because the mean of its divisors is an integer number (54936000).

Almost surely, 2^669040636 is an apocalyptic number.

It is an amenable number.

669040636 is a deficient number, since it is larger than the sum of its proper divisors (649423364).

669040636 is a wasteful number, since it uses less digits than its factorization.

669040636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490545 (or 490543 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 669040636 is about 25865.8198400901. The cubic root of 669040636 is about 874.6161629662.

The spelling of 669040636 in words is "six hundred sixty-nine million, forty thousand, six hundred thirty-six".