83640450 has 48 divisors (see below), whose sum is σ = 208200960. Its totient is φ = 22221120.

The previous prime is 83640433. The next prime is 83640457. The reversal of 83640450 is 5404638.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (83640457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46671 + ... + 48429.

It is an arithmetic number, because the mean of its divisors is an integer number (4337520).

Almost surely, 2^83640450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83640450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104100480).

83640450 is an abundant number, since it is smaller than the sum of its proper divisors (124560510).

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

83640450 is a wasteful number, since it uses less digits than its factorization.

83640450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091 (or 2086 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 83640450 is about 9145.5152943943. The cubic root of 83640450 is about 437.3261567819.

The spelling of 83640450 in words is "eighty-three million, six hundred forty thousand, four hundred fifty".