83640906 has 24 divisors (see below), whose sum is σ = 181437984. Its totient is φ = 27847080.

The previous prime is 83640847. The next prime is 83640923. The reversal of 83640906 is 60904638.

83640906 is a `hidden beast` number, since 8 + 3 + 640 + 9 + 0 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16305 + ... + 20811.

It is an arithmetic number, because the mean of its divisors is an integer number (7559916).

Almost surely, 2^83640906 is an apocalyptic number.

83640906 is an abundant number, since it is smaller than the sum of its proper divisors (97797078).

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

83640906 is a wasteful number, since it uses less digits than its factorization.

83640906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546 (or 5543 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 83640906 is about 9145.5402246122. The cubic root of 83640906 is about 437.3269515343.

The spelling of 83640906 in words is "eighty-three million, six hundred forty thousand, nine hundred six".