86905529778 has 16 divisors (see below), whose sum is σ = 174532270176. Its totient is φ = 28848308160.

The previous prime is 86905529749. The next prime is 86905529783. The reversal of 86905529778 is 87792550968.

It is a happy number.

It is a super-2 number, since 2×86905529778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30048876 + ... + 30051767.

It is an arithmetic number, because the mean of its divisors is an integer number (10908266886).

Almost surely, 2^86905529778 is an apocalyptic number.

86905529778 is an abundant number, since it is smaller than the sum of its proper divisors (87626740398).

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

86905529778 is a wasteful number, since it uses less digits than its factorization.

86905529778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60100889.

The product of its (nonzero) digits is 76204800, while the sum is 66.

The spelling of 86905529778 in words is "eighty-six billion, nine hundred five million, five hundred twenty-nine thousand, seven hundred seventy-eight".