84250640 has 40 divisors (see below), whose sum is σ = 207408600. Its totient is φ = 31717376.

The previous prime is 84250637. The next prime is 84250651. The reversal of 84250640 is 4605248.

It can be written as a sum of positive squares in 4 ways, for example, as 21270544 + 62980096 = 4612^2 + 7936^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29615 + ... + 32334.

It is an arithmetic number, because the mean of its divisors is an integer number (5185215).

Almost surely, 2^84250640 is an apocalyptic number.

84250640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84250640 is an abundant number, since it is smaller than the sum of its proper divisors (123157960).

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

84250640 is a wasteful number, since it uses less digits than its factorization.

84250640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61979 (or 61973 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 84250640 is about 9178.8147382982. The cubic root of 84250640 is about 438.3870698319.

Adding to 84250640 its reverse (4605248), we get a palindrome (88855888).

The spelling of 84250640 in words is "eighty-four million, two hundred fifty thousand, six hundred forty".