86747781 has 8 divisors (see below), whose sum is σ = 117390304. Its totient is φ = 56968560.

The previous prime is 86747761. The next prime is 86747783. The reversal of 86747781 is 18774768.

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

It is not a de Polignac number, because 86747781 - 2¹³ = 86739589 is a prime.

It is a super-2 number, since 2×86747781² = 15050355016847922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86747781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86747783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215590 + ... + 215991.

It is an arithmetic number, because the mean of its divisors is an integer number (14673788).

Almost surely, 2^86747781 is an apocalyptic number.

It is an amenable number.

86747781 is a deficient number, since it is larger than the sum of its proper divisors (30642523).

86747781 is a wasteful number, since it uses less digits than its factorization.

86747781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431651.

The product of its digits is 526848, while the sum is 48.

The square root of 86747781 is about 9313.8488821754. The cubic root of 86747781 is about 442.6761506225.

The spelling of 86747781 in words is "eighty-six million, seven hundred forty-seven thousand, seven hundred eighty-one".