83621538 has 288 divisors, whose sum is σ = 270371520. Its totient is φ = 18869760.

The previous prime is 83621501. The next prime is 83621543. The reversal of 83621538 is 83512638.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4918906 + ... + 4918922.

It is an arithmetic number, because the mean of its divisors is an integer number (938790).

Almost surely, 2^83621538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83621538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135185760).

83621538 is an abundant number, since it is smaller than the sum of its proper divisors (186749982).

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

83621538 is a wasteful number, since it uses less digits than its factorization.

83621538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 53 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 83621538 is about 9144.4812865465. The cubic root of 83621538 is about 437.2931929240.

Subtracting from 83621538 its reverse (83512638), we obtain a square (108900 = 330²).

The spelling of 83621538 in words is "eighty-three million, six hundred twenty-one thousand, five hundred thirty-eight".