261628793 has 6 divisors (see below), whose sum is σ = 277089354. Its totient is φ = 246176096.

The previous prime is 261628771. The next prime is 261628847. The reversal of 261628793 is 397826162.

It can be written as a sum of positive squares in only one way, i.e., 246238864 + 15389929 = 15692^2 + 3923^2 .

It is a de Polignac number, because none of the positive numbers 2^k-261628793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261628733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64730 + ... + 68652.

It is an arithmetic number, because the mean of its divisors is an integer number (46181559).

Almost surely, 2^261628793 is an apocalyptic number.

It is an amenable number.

261628793 is a deficient number, since it is larger than the sum of its proper divisors (15460561).

261628793 is an frugal number, since it uses more digits than its factorization.

261628793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7863 (or 3940 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 261628793 is about 16174.9433692981. The cubic root of 261628793 is about 639.5804484935.

The spelling of 261628793 in words is "two hundred sixty-one million, six hundred twenty-eight thousand, seven hundred ninety-three".