83778660 has 72 divisors (see below), whose sum is σ = 290437056. Its totient is φ = 19149120.

The previous prime is 83778649. The next prime is 83778691. The reversal of 83778660 is 6687738.

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

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, 31986 + ... + 34505.

It is an arithmetic number, because the mean of its divisors is an integer number (4033848).

Almost surely, 2^83778660 is an apocalyptic number.

It is an amenable number.

83778660 is an abundant number, since it is smaller than the sum of its proper divisors (206658396).

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

83778660 is a wasteful number, since it uses less digits than its factorization.

83778660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66513 (or 66508 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 83778660 is about 9153.0683379946. The cubic root of 83778660 is about 437.5669078623.

It can be divided in two parts, 837 and 78660, that added together give a palindrome (79497).

The spelling of 83778660 in words is "eighty-three million, seven hundred seventy-eight thousand, six hundred sixty".