669173040 has 240 divisors, whose sum is σ = 2484001728. Its totient is φ = 160579584.

The previous prime is 669173039. The next prime is 669173041. The reversal of 669173040 is 40371966.

It is an interprime number because it is at equal distance from previous prime (669173039) and next prime (669173041).

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 669172986 and 669173004.

It is not an unprimeable number, because it can be changed into a prime (669173041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 280332 + ... + 282708.

Almost surely, 2^669173040 is an apocalyptic number.

669173040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669173040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1242000864).

669173040 is an abundant number, since it is smaller than the sum of its proper divisors (1814828688).

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

669173040 is a wasteful number, since it uses less digits than its factorization.

669173040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436 (or 2427 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 669173040 is about 25868.3791529350. The cubic root of 669173040 is about 874.6738550474.

The spelling of 669173040 in words is "six hundred sixty-nine million, one hundred seventy-three thousand, forty".