8379902781 has 6 divisors (see below), whose sum is σ = 12104304030. Its totient is φ = 5586601848.

The previous prime is 8379902771. The next prime is 8379902833. The reversal of 8379902781 is 1872099738.

It can be written as a sum of positive squares in only one way, i.e., 8224676100 + 155226681 = 90690^2 + 12459^2 .

It is not a de Polignac number, because 8379902781 - 2¹⁷ = 8379771709 is a prime.

It is a super-2 number, since 2×8379902781² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8379902761) 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, 465550146 + ... + 465550163.

It is an arithmetic number, because the mean of its divisors is an integer number (2017384005).

Almost surely, 2^8379902781 is an apocalyptic number.

It is an amenable number.

8379902781 is a deficient number, since it is larger than the sum of its proper divisors (3724401249).

8379902781 is a wasteful number, since it uses less digits than its factorization.

8379902781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931100315 (or 931100312 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 8379902781 is about 91541.8089235733. The cubic root of 8379902781 is about 2031.1702491564.

The spelling of 8379902781 in words is "eight billion, three hundred seventy-nine million, nine hundred two thousand, seven hundred eighty-one".