84911257840 has 40 divisors (see below), whose sum is σ = 197806625280. Its totient is φ = 33897758976.

The previous prime is 84911257771. The next prime is 84911257843. The reversal of 84911257840 is 4875211948.

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

It is a super-2 number, since 2×84911257840² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84911257843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1001904 + ... + 1083343.

It is an arithmetic number, because the mean of its divisors is an integer number (4945165632).

Almost surely, 2^84911257840 is an apocalyptic number.

84911257840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84911257840 is an abundant number, since it is smaller than the sum of its proper divisors (112895367440).

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

84911257840 is a wasteful number, since it uses less digits than its factorization.

84911257840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085769 (or 2085763 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 84911257840 in words is "eighty-four billion, nine hundred eleven million, two hundred fifty-seven thousand, eight hundred forty".