86215500 has 432 divisors, whose sum is σ = 349562304. Its totient is φ = 17740800.

The previous prime is 86215499. The next prime is 86215511. The reversal of 86215500 is 551268.

It is a super-2 number, since 2×86215500² = 14866224880500000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3748489 + ... + 3748511.

It is an arithmetic number, because the mean of its divisors is an integer number (809172).

Almost surely, 2^86215500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86215500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174781152).

86215500 is an abundant number, since it is smaller than the sum of its proper divisors (263346804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86215500 is a wasteful number, since it uses less digits than its factorization.

86215500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 86215500 is about 9285.2302071623. The cubic root of 86215500 is about 441.7688778909.

Adding to 86215500 its reverse (551268), we get a palindrome (86766768).

The spelling of 86215500 in words is "eighty-six million, two hundred fifteen thousand, five hundred".