261715890428 has 12 divisors (see below), whose sum is σ = 470381262792. Its totient is φ = 127321243920.

The previous prime is 261715890427. The next prime is 261715890493. The reversal of 261715890428 is 824098517162.

It is a self number, because there is not a number n which added to its sum of digits gives 261715890428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261715890421) 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, 884175158 + ... + 884175453.

It is an arithmetic number, because the mean of its divisors is an integer number (39198438566).

Almost surely, 2^261715890428 is an apocalyptic number.

It is an amenable number.

261715890428 is a deficient number, since it is larger than the sum of its proper divisors (208665372364).

261715890428 is a wasteful number, since it uses less digits than its factorization.

261715890428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768350652 (or 1768350650 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 53.

The spelling of 261715890428 in words is "two hundred sixty-one billion, seven hundred fifteen million, eight hundred ninety thousand, four hundred twenty-eight".