85404372781 has 8 divisors (see below), whose sum is σ = 105113074304. Its totient is φ = 67572690480.

The previous prime is 85404372689. The next prime is 85404372799. The reversal of 85404372781 is 18727340458.

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

It is a cyclic number.

It is not a de Polignac number, because 85404372781 - 2¹⁹ = 85403848493 is a prime.

It is a super-2 number, since 2×85404372781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85404372881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469254705 + ... + 469254886.

It is an arithmetic number, because the mean of its divisors is an integer number (13139134288).

Almost surely, 2^85404372781 is an apocalyptic number.

It is an amenable number.

85404372781 is a deficient number, since it is larger than the sum of its proper divisors (19708701523).

85404372781 is a wasteful number, since it uses less digits than its factorization.

85404372781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938509611.

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 85404372781 in words is "eighty-five billion, four hundred four million, three hundred seventy-two thousand, seven hundred eighty-one".