84345640 has 16 divisors (see below), whose sum is σ = 189777780. Its totient is φ = 33738240.

The previous prime is 84345629. The next prime is 84345641. The reversal of 84345640 is 4654348.

It can be written as a sum of positive squares in 2 ways, for example, as 82555396 + 1790244 = 9086^2 + 1338^2 .

It is a super-2 number, since 2×84345640² = 14228373974019200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 84345596 and 84345605.

It is not an unprimeable number, because it can be changed into a prime (84345641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1054281 + ... + 1054360.

Almost surely, 2^84345640 is an apocalyptic number.

It is an amenable number.

84345640 is an abundant number, since it is smaller than the sum of its proper divisors (105432140).

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

84345640 is a wasteful number, since it uses less digits than its factorization.

84345640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108652 (or 2108648 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 84345640 is about 9183.9882404106. The cubic root of 84345640 is about 438.5517812532.

Adding to 84345640 its reverse (4654348), we get a palindrome (88999988).

The spelling of 84345640 in words is "eighty-four million, three hundred forty-five thousand, six hundred forty".