84621440 has 64 divisors (see below), whose sum is σ = 212976000. Its totient is φ = 32062464.

The previous prime is 84621437. The next prime is 84621451. The reversal of 84621440 is 4412648.

It is a tau number, because it is divible by the number of its divisors (64).

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, 8681 + ... + 15639.

It is an arithmetic number, because the mean of its divisors is an integer number (3327750).

Almost surely, 2^84621440 is an apocalyptic number.

84621440 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 84621440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106488000).

84621440 is an abundant number, since it is smaller than the sum of its proper divisors (128354560).

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

84621440 is a wasteful number, since it uses less digits than its factorization.

84621440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997 (or 6985 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 84621440 is about 9198.9912490446. The cubic root of 84621440 is about 439.0292648821.

The spelling of 84621440 in words is "eighty-four million, six hundred twenty-one thousand, four hundred forty".