261764757228 has 48 divisors (see below), whose sum is σ = 661803301376. Its totient is φ = 80048865600.

The previous prime is 261764757217. The next prime is 261764757277. The reversal of 261764757228 is 822757467162.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5121748 + ... + 5172603.

Almost surely, 2^261764757228 is an apocalyptic number.

It is an amenable number.

261764757228 is an abundant number, since it is smaller than the sum of its proper divisors (400038544148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261764757228 is a wasteful number, since it uses less digits than its factorization.

261764757228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10294534 (or 10294532 counting only the distinct ones).

The product of its digits is 15805440, while the sum is 57.

The spelling of 261764757228 in words is "two hundred sixty-one billion, seven hundred sixty-four million, seven hundred fifty-seven thousand, two hundred twenty-eight".