86878388 has 6 divisors (see below), whose sum is σ = 152037186. Its totient is φ = 43439192.

The previous prime is 86878387. The next prime is 86878409. The reversal of 86878388 is 88387868.

It can be written as a sum of positive squares in only one way, i.e., 46403344 + 40475044 = 6812^2 + 6362^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86878387) by changing a digit.

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, 10859795 + ... + 10859802.

It is an arithmetic number, because the mean of its divisors is an integer number (25339531).

Almost surely, 2^86878388 is an apocalyptic number.

It is an amenable number.

86878388 is a deficient number, since it is larger than the sum of its proper divisors (65158798).

86878388 is a wasteful number, since it uses less digits than its factorization.

86878388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21719601 (or 21719599 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 56.

The square root of 86878388 is about 9320.8576858570. The cubic root of 86878388 is about 442.8982028428.

The spelling of 86878388 in words is "eighty-six million, eight hundred seventy-eight thousand, three hundred eighty-eight".