80839840 has 48 divisors (see below), whose sum is σ = 194608008. Its totient is φ = 31722496.

The previous prime is 80839817. The next prime is 80839873. The reversal of 80839840 is 4893808.

It can be written as a sum of positive squares in 4 ways, for example, as 60155536 + 20684304 = 7756^2 + 4548^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 80839793 and 80839802.

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, 3714 + ... + 13246.

Almost surely, 2^80839840 is an apocalyptic number.

80839840 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 80839840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97304004).

80839840 is an abundant number, since it is smaller than the sum of its proper divisors (113768168).

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

80839840 is a wasteful number, since it uses less digits than its factorization.

80839840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9601 (or 9593 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 80839840 is about 8991.0978195101. The cubic root of 80839840 is about 432.3895092362.

The spelling of 80839840 in words is "eighty million, eight hundred thirty-nine thousand, eight hundred forty".