86669640 has 96 divisors (see below), whose sum is σ = 296524800. Its totient is φ = 21893760.

The previous prime is 86669633. The next prime is 86669641. The reversal of 86669640 is 4696668.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (86669641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 505 + ... + 13175.

It is an arithmetic number, because the mean of its divisors is an integer number (3088800).

Almost surely, 2^86669640 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 86669640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148262400).

86669640 is an abundant number, since it is smaller than the sum of its proper divisors (209855160).

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

86669640 is a wasteful number, since it uses less digits than its factorization.

86669640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12707 (or 12700 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 86669640 is about 9309.6530547599. The cubic root of 86669640 is about 442.5431921834.

The spelling of 86669640 in words is "eighty-six million, six hundred sixty-nine thousand, six hundred forty".