669732840 has 128 divisors (see below), whose sum is σ = 2551392000. Its totient is φ = 153080064.

The previous prime is 669732839. The next prime is 669732841. The reversal of 669732840 is 48237966.

It is an interprime number because it is at equal distance from previous prime (669732839) and next prime (669732841).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (669732841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36735 + ... + 51854.

It is an arithmetic number, because the mean of its divisors is an integer number (19932750).

Almost surely, 2^669732840 is an apocalyptic number.

669732840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669732840 is an abundant number, since it is smaller than the sum of its proper divisors (1881659160).

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

669732840 is a wasteful number, since it uses less digits than its factorization.

669732840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88616 (or 88606 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 669732840 is about 25879.1970509133. The cubic root of 669732840 is about 874.9176913053.

The spelling of 669732840 in words is "six hundred sixty-nine million, seven hundred thirty-two thousand, eight hundred forty".