85347840 has 80 divisors (see below), whose sum is σ = 272870928. Its totient is φ = 22757376.

The previous prime is 85347833. The next prime is 85347853. The reversal of 85347840 is 4874358.

It is a tau number, because it is divible by the number of its divisors (80).

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, 2124 + ... + 13236.

Almost surely, 2^85347840 is an apocalyptic number.

85347840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85347840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136435464).

85347840 is an abundant number, since it is smaller than the sum of its proper divisors (187523088).

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

85347840 is a wasteful number, since it uses less digits than its factorization.

85347840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11139 (or 11123 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 85347840 is about 9238.3894700321. The cubic root of 85347840 is about 440.2819130005.

The spelling of 85347840 in words is "eighty-five million, three hundred forty-seven thousand, eight hundred forty".