86781798 has 24 divisors (see below), whose sum is σ = 193110528. Its totient is φ = 28145232.

The previous prime is 86781791. The next prime is 86781811. The reversal of 86781798 is 89718768.

It is a super-2 number, since 2×86781798² = 15062160928225608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86781791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64486 + ... + 65817.

It is an arithmetic number, because the mean of its divisors is an integer number (8046272).

Almost surely, 2^86781798 is an apocalyptic number.

86781798 is an abundant number, since it is smaller than the sum of its proper divisors (106328730).

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

86781798 is a wasteful number, since it uses less digits than its factorization.

86781798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130348 (or 130345 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 86781798 is about 9315.6748547811. The cubic root of 86781798 is about 442.7340062684.

The spelling of 86781798 in words is "eighty-six million, seven hundred eighty-one thousand, seven hundred ninety-eight".