84781040 has 120 divisors (see below), whose sum is σ = 221555760. Its totient is φ = 30081024.

The previous prime is 84781019. The next prime is 84781061. The reversal of 84781040 is 4018748.

It is an interprime number because it is at equal distance from previous prime (84781019) and next prime (84781061).

It is a junction number, because it is equal to n+sod(n) for n = 84780988 and 84781006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 439184 + ... + 439376.

It is an arithmetic number, because the mean of its divisors is an integer number (1846298).

Almost surely, 2^84781040 is an apocalyptic number.

84781040 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 84781040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110777880).

84781040 is an abundant number, since it is smaller than the sum of its proper divisors (136774720).

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

84781040 is a wasteful number, since it uses less digits than its factorization.

84781040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 84781040 is about 9207.6620268122. The cubic root of 84781040 is about 439.3051014613.

Adding to 84781040 its reverse (4018748), we get a palindrome (88799788).

The spelling of 84781040 in words is "eighty-four million, seven hundred eighty-one thousand, forty".