83640655 has 8 divisors (see below), whose sum is σ = 114707232. Its totient is φ = 57353568.

The previous prime is 83640653. The next prime is 83640671. The reversal of 83640655 is 55604638.

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

It is a cyclic number.

It is not a de Polignac number, because 83640655 - 2¹ = 83640653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83640653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194832 + ... + 1194901.

It is an arithmetic number, because the mean of its divisors is an integer number (14338404).

Almost surely, 2^83640655 is an apocalyptic number.

83640655 is a deficient number, since it is larger than the sum of its proper divisors (31066577).

83640655 is a wasteful number, since it uses less digits than its factorization.

83640655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389745.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 83640655 is about 9145.5265020665. The cubic root of 83640655 is about 437.3265140723.

The spelling of 83640655 in words is "eighty-three million, six hundred forty thousand, six hundred fifty-five".