1720464138 has 20 divisors (see below), whose sum is σ = 3855114450. Its totient is φ = 573487992.

The previous prime is 1720464113. The next prime is 1720464139. The reversal of 1720464138 is 8314640271.

1720464138 is a `hidden beast` number, since 1 + 7 + 2 + 0 + 4 + 641 + 3 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 918271809 + 802192329 = 30303^2 + 28323^2 .

It is not an unprimeable number, because it can be changed into a prime (1720464139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5309913 + ... + 5310236.

Almost surely, 2^1720464138 is an apocalyptic number.

1720464138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1720464138 is an abundant number, since it is smaller than the sum of its proper divisors (2134650312).

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

1720464138 is a wasteful number, since it uses less digits than its factorization.

1720464138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10620163 (or 10620154 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 1720464138 is about 41478.4780096859. The cubic root of 1720464138 is about 1198.2530455259.

The spelling of 1720464138 in words is "one billion, seven hundred twenty million, four hundred sixty-four thousand, one hundred thirty-eight".