730120661 has 4 divisors (see below), whose sum is σ = 747928524. Its totient is φ = 712312800.

The previous prime is 730120639. The next prime is 730120673. The reversal of 730120661 is 166021037.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 357399025 + 372721636 = 18905^2 + 19306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-730120661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 730120661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730120631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8903870 + ... + 8903951.

It is an arithmetic number, because the mean of its divisors is an integer number (186982131).

Almost surely, 2^730120661 is an apocalyptic number.

It is an amenable number.

730120661 is a deficient number, since it is larger than the sum of its proper divisors (17807863).

730120661 is a wasteful number, since it uses less digits than its factorization.

730120661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17807862.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 730120661 is about 27020.7450119348. The cubic root of 730120661 is about 900.4609412517.

Adding to 730120661 its reverse (166021037), we get a palindrome (896141698).

The spelling of 730120661 in words is "seven hundred thirty million, one hundred twenty thousand, six hundred sixty-one".