86817780 has 72 divisors (see below), whose sum is σ = 300972672. Its totient is φ = 19843776.

The previous prime is 86817779. The next prime is 86817791. The reversal of 86817780 is 8771868.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33192 + ... + 35711.

It is an arithmetic number, because the mean of its divisors is an integer number (4180176).

Almost surely, 2^86817780 is an apocalyptic number.

It is an amenable number.

86817780 is an abundant number, since it is smaller than the sum of its proper divisors (214154892).

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

86817780 is a wasteful number, since it uses less digits than its factorization.

86817780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68925 (or 68920 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 86817780 is about 9317.6059156846. The cubic root of 86817780 is about 442.7951875075.

It can be divided in two parts, 8681 and 7780, that added together give a palindrome (16461).

The spelling of 86817780 in words is "eighty-six million, eight hundred seventeen thousand, seven hundred eighty".