1720068638 has 8 divisors (see below), whose sum is σ = 2594517480. Its totient is φ = 855229480.

The previous prime is 1720068629. The next prime is 1720068719. The reversal of 1720068638 is 8368600271.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1720068638² = 5917272238862350088, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1720068595 and 1720068604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2401973 + ... + 2402688.

It is an arithmetic number, because the mean of its divisors is an integer number (324314685).

Almost surely, 2^1720068638 is an apocalyptic number.

1720068638 is a deficient number, since it is larger than the sum of its proper divisors (874448842).

1720068638 is a wasteful number, since it uses less digits than its factorization.

1720068638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4804842.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 1720068638 is about 41473.7102029707. The cubic root of 1720068638 is about 1198.1612204213.

The spelling of 1720068638 in words is "one billion, seven hundred twenty million, sixty-eight thousand, six hundred thirty-eight".