86721610 has 8 divisors (see below), whose sum is σ = 156098916. Its totient is φ = 34688640.

The previous prime is 86721587. The next prime is 86721611. The reversal of 86721610 is 1612768.

It can be written as a sum of positive squares in 2 ways, for example, as 80802121 + 5919489 = 8989^2 + 2433^2 .

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

It is not an unprimeable number, because it can be changed into a prime (86721611) 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 3 ways as a sum of consecutive naturals, for example, 4336071 + ... + 4336090.

Almost surely, 2^86721610 is an apocalyptic number.

86721610 is a deficient number, since it is larger than the sum of its proper divisors (69377306).

86721610 is a wasteful number, since it uses less digits than its factorization.

86721610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8672168.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 86721610 is about 9312.4438253339. The cubic root of 86721610 is about 442.6316290503.

The spelling of 86721610 in words is "eighty-six million, seven hundred twenty-one thousand, six hundred ten".