669415440 has 80 divisors (see below), whose sum is σ = 2114382528. Its totient is φ = 175139328.

The previous prime is 669415421. The next prime is 669415441. The reversal of 669415440 is 44514966.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (669415441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13594 + ... + 39033.

Almost surely, 2^669415440 is an apocalyptic number.

669415440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669415440 is an abundant number, since it is smaller than the sum of its proper divisors (1444967088).

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

669415440 is a wasteful number, since it uses less digits than its factorization.

669415440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52696 (or 52690 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 669415440 is about 25873.0639855430. The cubic root of 669415440 is about 874.7794557089.

The spelling of 669415440 in words is "six hundred sixty-nine million, four hundred fifteen thousand, four hundred forty".