85730736078621 has 24 divisors (see below), whose sum is σ = 131117959622520. Its totient is φ = 53791685369856.

The previous prime is 85730736078619. The next prime is 85730736078623. The reversal of 85730736078621 is 12687063703758.

85730736078621 is a `hidden beast` number, since 8 + 573 + 0 + 7 + 36 + 0 + 7 + 8 + 6 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (85730736078619) and next prime (85730736078623).

It can be written as a sum of positive squares in 4 ways, for example, as 54450541241721 + 31280194836900 = 7379061^2 + 5592870^2 .

It is not a de Polignac number, because 85730736078621 - 2¹ = 85730736078619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85730736078623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86849725 + ... + 87831293.

It is an arithmetic number, because the mean of its divisors is an integer number (5463248317605).

Almost surely, 2^{85730736078621} is an apocalyptic number.

It is an amenable number.

85730736078621 is a deficient number, since it is larger than the sum of its proper divisors (45387223543899).

85730736078621 is a wasteful number, since it uses less digits than its factorization.

85730736078621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552445 (or 1552442 counting only the distinct ones).

The product of its (nonzero) digits is 71124480, while the sum is 63.

The spelling of 85730736078621 in words is "eighty-five trillion, seven hundred thirty billion, seven hundred thirty-six million, seventy-eight thousand, six hundred twenty-one".