86821755 has 8 divisors (see below), whose sum is σ = 138914832. Its totient is φ = 46304928.

The previous prime is 86821739. The next prime is 86821799. The reversal of 86821755 is 55712868.

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

It is not a de Polignac number, because 86821755 - 2⁴ = 86821739 is a prime.

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, 2894044 + ... + 2894073.

It is an arithmetic number, because the mean of its divisors is an integer number (17364354).

Almost surely, 2^86821755 is an apocalyptic number.

86821755 is a deficient number, since it is larger than the sum of its proper divisors (52093077).

86821755 is a wasteful number, since it uses less digits than its factorization.

86821755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5788125.

The product of its digits is 134400, while the sum is 42.

The square root of 86821755 is about 9317.8192191092. The cubic root of 86821755 is about 442.8019452784.

The spelling of 86821755 in words is "eighty-six million, eight hundred twenty-one thousand, seven hundred fifty-five".