83451640 has 48 divisors (see below), whose sum is σ = 199488600. Its totient is φ = 31412736.

The previous prime is 83451637. The next prime is 83451673. The reversal of 83451640 is 4615438.

It is a happy number.

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 11 ways as a sum of consecutive naturals, for example, 7951 + ... + 15169.

Almost surely, 2^83451640 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 83451640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99744300).

83451640 is an abundant number, since it is smaller than the sum of its proper divisors (116036960).

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

83451640 is a wasteful number, since it uses less digits than its factorization.

83451640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7264 (or 7243 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 83451640 is about 9135.1869165332. The cubic root of 83451640 is about 436.9968354146.

The spelling of 83451640 in words is "eighty-three million, four hundred fifty-one thousand, six hundred forty".