28101782661 has 8 divisors (see below), whose sum is σ = 37472070240. Its totient is φ = 18733008432.

The previous prime is 28101782641. The next prime is 28101782693. The reversal of 28101782661 is 16628710182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28101782661 - 2²² = 28097588357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28101782641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334275 + ... + 409808.

It is an arithmetic number, because the mean of its divisors is an integer number (4684008780).

Almost surely, 2^28101782661 is an apocalyptic number.

It is an amenable number.

28101782661 is a deficient number, since it is larger than the sum of its proper divisors (9370287579).

28101782661 is a wasteful number, since it uses less digits than its factorization.

28101782661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756675.

The product of its (nonzero) digits is 64512, while the sum is 42.

The spelling of 28101782661 in words is "twenty-eight billion, one hundred one million, seven hundred eighty-two thousand, six hundred sixty-one".