86777780 has 18 divisors (see below), whose sum is σ = 182320866. Its totient is φ = 34694448.

The previous prime is 86777767. The next prime is 86777791. The reversal of 86777780 is 8777768.

It can be written as a sum of positive squares in only one way, i.e., 69422224 + 17355556 = 8332^2 + 4166^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40619 + ... + 42701.

It is an arithmetic number, because the mean of its divisors is an integer number (10128937).

Almost surely, 2^86777780 is an apocalyptic number.

It is an amenable number.

86777780 is an abundant number, since it is smaller than the sum of its proper divisors (95543086).

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

86777780 is an equidigital number, since it uses as much as digits as its factorization.

86777780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175 (or 2090 counting only the distinct ones).

The product of its (nonzero) digits is 921984, while the sum is 50.

The square root of 86777780 is about 9315.4591942641. The cubic root of 86777780 is about 442.7271732968.

The spelling of 86777780 in words is "eighty-six million, seven hundred seventy-seven thousand, seven hundred eighty".