86720545 has 4 divisors (see below), whose sum is σ = 104064660. Its totient is φ = 69376432.

The previous prime is 86720537. The next prime is 86720581. The reversal of 86720545 is 54502768.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53450721 + 33269824 = 7311^2 + 5768^2 .

It is a cyclic number.

It is not a de Polignac number, because 86720545 - 2³ = 86720537 is a prime.

It is a super-3 number, since 3×86720545³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8672050 + ... + 8672059.

It is an arithmetic number, because the mean of its divisors is an integer number (26016165).

Almost surely, 2^86720545 is an apocalyptic number.

It is an amenable number.

86720545 is a deficient number, since it is larger than the sum of its proper divisors (17344115).

86720545 is a wasteful number, since it uses less digits than its factorization.

86720545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17344114.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 86720545 is about 9312.3866436054. The cubic root of 86720545 is about 442.6298171043.

It can be divided in two parts, 867 and 20545, that added together give a palindrome (21412).

The spelling of 86720545 in words is "eighty-six million, seven hundred twenty thousand, five hundred forty-five".