1790661457 has 16 divisors (see below), whose sum is σ = 1958151888. Its totient is φ = 1627499520.

The previous prime is 1790661443. The next prime is 1790661461. The reversal of 1790661457 is 7541660971.

It can be written as a sum of positive squares in 8 ways, for example, as 675168256 + 1115493201 = 25984^2 + 33399^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1790661457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1790661407) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 732357 + ... + 734797.

It is an arithmetic number, because the mean of its divisors is an integer number (122384493).

Almost surely, 2^1790661457 is an apocalyptic number.

It is an amenable number.

1790661457 is a deficient number, since it is larger than the sum of its proper divisors (167490431).

1790661457 is a wasteful number, since it uses less digits than its factorization.

1790661457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 1790661457 is about 42316.2079704692. The cubic root of 1790661457 is about 1214.3330874588. Note that the first 3 decimals are identical.

The spelling of 1790661457 in words is "one billion, seven hundred ninety million, six hundred sixty-one thousand, four hundred fifty-seven".