83640674 has 8 divisors (see below), whose sum is σ = 135111900. Its totient is φ = 38603376.

The previous prime is 83640671. The next prime is 83640707. The reversal of 83640674 is 47604638.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 83594449 + 46225 = 9143^2 + 215^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (83640671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1608449 + ... + 1608500.

Almost surely, 2^83640674 is an apocalyptic number.

83640674 is a deficient number, since it is larger than the sum of its proper divisors (51471226).

83640674 is a wasteful number, since it uses less digits than its factorization.

83640674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3216964.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 83640674 is about 9145.5275408256. The cubic root of 83640674 is about 437.3265471869.

The spelling of 83640674 in words is "eighty-three million, six hundred forty thousand, six hundred seventy-four".