85773807978 has 16 divisors (see below), whose sum is σ = 171565793280. Its totient is φ = 28588239776.

The previous prime is 85773807971. The next prime is 85773807991. The reversal of 85773807978 is 87970837758.

It is a super-2 number, since 2×85773807978² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85773807971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 695658 + ... + 809621.

It is an arithmetic number, because the mean of its divisors is an integer number (10722862080).

Almost surely, 2^85773807978 is an apocalyptic number.

85773807978 is an abundant number, since it is smaller than the sum of its proper divisors (85791985302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85773807978 is a wasteful number, since it uses less digits than its factorization.

85773807978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514781.

The product of its (nonzero) digits is 165957120, while the sum is 69.

The spelling of 85773807978 in words is "eighty-five billion, seven hundred seventy-three million, eight hundred seven thousand, nine hundred seventy-eight".