83681140 has 24 divisors (see below), whose sum is σ = 186068232. Its totient is φ = 31503360.

The previous prime is 83681137. The next prime is 83681159. The reversal of 83681140 is 4118638.

It can be written as a sum of positive squares in 4 ways, for example, as 1162084 + 82519056 = 1078^2 + 9084^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122721 + ... + 123400.

It is an arithmetic number, because the mean of its divisors is an integer number (7752843).

Almost surely, 2^83681140 is an apocalyptic number.

It is an amenable number.

83681140 is an abundant number, since it is smaller than the sum of its proper divisors (102387092).

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

83681140 is a wasteful number, since it uses less digits than its factorization.

83681140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246147 (or 246145 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 83681140 is about 9147.7396115106. The cubic root of 83681140 is about 437.3970631294.

Adding to 83681140 its reverse (4118638), we get a palindrome (87799778).

The spelling of 83681140 in words is "eighty-three million, six hundred eighty-one thousand, one hundred forty".