83521340 has 96 divisors (see below), whose sum is σ = 223534080. Its totient is φ = 25519104.

The previous prime is 83521337. The next prime is 83521343. The reversal of 83521340 is 4312538.

It is an interprime number because it is at equal distance from previous prime (83521337) and next prime (83521343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83521343) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 44297 + ... + 46143.

It is an arithmetic number, because the mean of its divisors is an integer number (2328480).

Almost surely, 2^83521340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83521340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111767040).

83521340 is an abundant number, since it is smaller than the sum of its proper divisors (140012740).

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

83521340 is a wasteful number, since it uses less digits than its factorization.

83521340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1897 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 83521340 is about 9139.0010395010. The cubic root of 83521340 is about 437.1184635556.

Adding to 83521340 its reverse (4312538), we get a palindrome (87833878).

The spelling of 83521340 in words is "eighty-three million, five hundred twenty-one thousand, three hundred forty".