1790728489 has 9 divisors (see below), whose sum is σ = 1968833181. Its totient is φ = 1627511820.

The previous prime is 1790728481. The next prime is 1790728493. The reversal of 1790728489 is 9848270971.

It is a happy number.

The square root of 1790728489 is 42317.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1790728489 - 2³ = 1790728481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1790728481) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 463564 + ... + 467410.

Almost surely, 2^1790728489 is an apocalyptic number.

1790728489 is the 42317-th square number.

1790728489 is the 21159-th centered octagonal number.

It is an amenable number.

1790728489 is a deficient number, since it is larger than the sum of its proper divisors (178104692).

1790728489 is an frugal number, since it uses more digits than its factorization.

1790728489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7716 (or 3858 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 55.

The cubic root of 1790728489 is about 1214.3482398036.

The spelling of 1790728489 in words is "one billion, seven hundred ninety million, seven hundred twenty-eight thousand, four hundred eighty-nine".