28761963901 has 6 divisors (see below), whose sum is σ = 31614390206. Its totient is φ = 26147239800.

The previous prime is 28761963877. The next prime is 28761963917. The reversal of 28761963901 is 10936916782.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15749999001 + 13011964900 = 125499^2 + 114070^2 .

It is not a de Polignac number, because 28761963901 - 2³¹ = 26614480253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28761963941) 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, 118850970 + ... + 118851211.

Almost surely, 2^28761963901 is an apocalyptic number.

It is an amenable number.

28761963901 is a deficient number, since it is larger than the sum of its proper divisors (2852426305).

28761963901 is a wasteful number, since it uses less digits than its factorization.

28761963901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237702203 (or 237702192 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 28761963901 in words is "twenty-eight billion, seven hundred sixty-one million, nine hundred sixty-three thousand, nine hundred one".