4891221504 has 320 divisors, whose sum is σ = 16519567680. Its totient is φ = 1415577600.

The previous prime is 4891221479. The next prime is 4891221523. The reversal of 4891221504 is 4051221984.

4891221504 is a `hidden beast` number, since 48 + 91 + 2 + 21 + 504 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3054304 + ... + 3055904.

It is an arithmetic number, because the mean of its divisors is an integer number (51623649).

Almost surely, 2^4891221504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4891221504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8259783840).

4891221504 is an abundant number, since it is smaller than the sum of its proper divisors (11628346176).

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

4891221504 is a wasteful number, since it uses less digits than its factorization.

4891221504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 4891221504 is about 69937.2683481418. The cubic root of 4891221504 is about 1697.4843419134.

The spelling of 4891221504 in words is "four billion, eight hundred ninety-one million, two hundred twenty-one thousand, five hundred four".