83331640 has 32 divisors (see below), whose sum is σ = 214282080. Its totient is φ = 28570752.

The previous prime is 83331613. The next prime is 83331653. The reversal of 83331640 is 4613338.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 83331599 and 83331608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148527 + ... + 149086.

It is an arithmetic number, because the mean of its divisors is an integer number (6696315).

Almost surely, 2^83331640 is an apocalyptic number.

It is an amenable number.

83331640 is an abundant number, since it is smaller than the sum of its proper divisors (130950440).

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

83331640 is a wasteful number, since it uses less digits than its factorization.

83331640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297631 (or 297627 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 83331640 is about 9128.6165435952. The cubic root of 83331640 is about 436.7872738223.

Adding to 83331640 its reverse (4613338), we get a palindrome (87944978).

The spelling of 83331640 in words is "eighty-three million, three hundred thirty-one thousand, six hundred forty".