83637021 has 32 divisors (see below), whose sum is σ = 125338752. Its totient is φ = 49271040.

The previous prime is 83637013. The next prime is 83637053. The reversal of 83637021 is 12073638.

It is not a de Polignac number, because 83637021 - 2³ = 83637013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83637021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83633021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88411 + ... + 89351.

It is an arithmetic number, because the mean of its divisors is an integer number (3916836).

Almost surely, 2^83637021 is an apocalyptic number.

It is an amenable number.

83637021 is a deficient number, since it is larger than the sum of its proper divisors (41701731).

83637021 is a wasteful number, since it uses less digits than its factorization.

83637021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 83637021 is about 9145.3278235392. The cubic root of 83637021 is about 437.3201803598.

The spelling of 83637021 in words is "eighty-three million, six hundred thirty-seven thousand, twenty-one".