86781505 has 8 divisors (see below), whose sum is σ = 106353792. Its totient is φ = 67947888.

The previous prime is 86781503. The next prime is 86781521. The reversal of 86781505 is 50518768.

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 86781505 - 2¹ = 86781503 is a prime.

It is a super-2 number, since 2×86781505² = 15062059220130050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86781503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184407 + ... + 184876.

It is an arithmetic number, because the mean of its divisors is an integer number (13294224).

Almost surely, 2^86781505 is an apocalyptic number.

It is an amenable number.

86781505 is a deficient number, since it is larger than the sum of its proper divisors (19572287).

86781505 is a wasteful number, since it uses less digits than its factorization.

86781505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369335.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 86781505 is about 9315.6591285856. The cubic root of 86781505 is about 442.7335080026.

The spelling of 86781505 in words is "eighty-six million, seven hundred eighty-one thousand, five hundred five".