86640542 has 4 divisors (see below), whose sum is σ = 129960816. Its totient is φ = 43320270.

The previous prime is 86640539. The next prime is 86640553. The reversal of 86640542 is 24504668.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 21660134 + ... + 21660137.

It is an arithmetic number, because the mean of its divisors is an integer number (32490204).

Almost surely, 2^86640542 is an apocalyptic number.

86640542 is a deficient number, since it is larger than the sum of its proper divisors (43320274).

86640542 is a wasteful number, since it uses less digits than its factorization.

86640542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43320273.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 86640542 is about 9308.0901370797. The cubic root of 86640542 is about 442.4936609474.

The spelling of 86640542 in words is "eighty-six million, six hundred forty thousand, five hundred forty-two".