83640812 has 18 divisors (see below), whose sum is σ = 154483308. Its totient is φ = 39618648.

The previous prime is 83640773. The next prime is 83640839. The reversal of 83640812 is 21804638.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27518 + ... + 30405.

It is an arithmetic number, because the mean of its divisors is an integer number (8582406).

Almost surely, 2^83640812 is an apocalyptic number.

It is an amenable number.

83640812 is a deficient number, since it is larger than the sum of its proper divisors (70842496).

83640812 is a wasteful number, since it uses less digits than its factorization.

83640812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57965 (or 57944 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 83640812 is about 9145.5350854939. The cubic root of 83640812 is about 437.3267877040.

The spelling of 83640812 in words is "eighty-three million, six hundred forty thousand, eight hundred twelve".