1790721736 has 8 divisors (see below), whose sum is σ = 3357603270. Its totient is φ = 895360864.

The previous prime is 1790721721. The next prime is 1790721767. The reversal of 1790721736 is 6371270971.

It can be written as a sum of positive squares in only one way, i.e., 1163219236 + 627502500 = 34106^2 + 25050^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1790721692 and 1790721701.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111920101 + ... + 111920116.

Almost surely, 2^1790721736 is an apocalyptic number.

It is an amenable number.

1790721736 is a deficient number, since it is larger than the sum of its proper divisors (1566881534).

1790721736 is a wasteful number, since it uses less digits than its factorization.

1790721736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223840223 (or 223840219 counting only the distinct ones).

The product of its (nonzero) digits is 111132, while the sum is 43.

The square root of 1790721736 is about 42316.9202092969. The cubic root of 1790721736 is about 1214.3467133292.

The spelling of 1790721736 in words is "one billion, seven hundred ninety million, seven hundred twenty-one thousand, seven hundred thirty-six".