1669926720 has 896 divisors, whose sum is σ = 7373721600. Its totient is φ = 309657600.

The previous prime is 1669926719. The next prime is 1669926751. The reversal of 1669926720 is 276299661.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1669926720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 40729900 + ... + 40729940.

It is an arithmetic number, because the mean of its divisors is an integer number (8229600).

Almost surely, 2^1669926720 is an apocalyptic number.

1669926720 is a gapful number since it is divisible by the number (10) 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 1669926720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3686860800).

1669926720 is an abundant number, since it is smaller than the sum of its proper divisors (5703794880).

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

1669926720 is a wasteful number, since it uses less digits than its factorization.

1669926720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 1669926720 is about 40864.7368766764. The cubic root of 1669926720 is about 1186.4036421356.

The spelling of 1669926720 in words is "one billion, six hundred sixty-nine million, nine hundred twenty-six thousand, seven hundred twenty".