86280639 has 4 divisors (see below), whose sum is σ = 115040856. Its totient is φ = 57520424.

The previous prime is 86280637. The next prime is 86280647. The reversal of 86280639 is 93608268.

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

It is a cyclic number.

It is not a de Polignac number, because 86280639 - 2¹ = 86280637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86280639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86280631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14380104 + ... + 14380109.

It is an arithmetic number, because the mean of its divisors is an integer number (28760214).

Almost surely, 2^86280639 is an apocalyptic number.

86280639 is a deficient number, since it is larger than the sum of its proper divisors (28760217).

86280639 is a wasteful number, since it uses less digits than its factorization.

86280639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28760216.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 86280639 is about 9288.7372123449. The cubic root of 86280639 is about 441.8801074601.

The spelling of 86280639 in words is "eighty-six million, two hundred eighty thousand, six hundred thirty-nine".