83656638 has 48 divisors (see below), whose sum is σ = 202443696. Its totient is φ = 25738560.

The previous prime is 83656637. The next prime is 83656649. The reversal of 83656638 is 83665638.

83656638 is a `hidden beast` number, since 8 + 3 + 6 + 5 + 6 + 638 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 83656593 and 83656602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83656633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 303 + ... + 12938.

It is an arithmetic number, because the mean of its divisors is an integer number (4217577).

Almost surely, 2^83656638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83656638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101221848).

83656638 is an abundant number, since it is smaller than the sum of its proper divisors (118787058).

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

83656638 is a wasteful number, since it uses less digits than its factorization.

83656638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13271 (or 13259 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 83656638 is about 9146.4002755182. The cubic root of 83656638 is about 437.3543687262.

The spelling of 83656638 in words is "eighty-three million, six hundred fifty-six thousand, six hundred thirty-eight".