1720627920 has 400 divisors, whose sum is σ = 6611362560. Its totient is φ = 411264000.

The previous prime is 1720627891. The next prime is 1720627921. The reversal of 1720627920 is 297260271.

1720627920 is a `hidden beast` number, since 1 + 7 + 2 + 0 + 627 + 9 + 20 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720627921) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7199161 + ... + 7199399.

Almost surely, 2^1720627920 is an apocalyptic number.

1720627920 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 1720627920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3305681280).

1720627920 is an abundant number, since it is smaller than the sum of its proper divisors (4890734640).

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

1720627920 is a wasteful number, since it uses less digits than its factorization.

1720627920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 1720627920 is about 41480.4522636868. The cubic root of 1720627920 is about 1198.2910674466.

The spelling of 1720627920 in words is "one billion, seven hundred twenty million, six hundred twenty-seven thousand, nine hundred twenty".