4645721808 has 240 divisors, whose sum is σ = 16394117376. Its totient is φ = 1195223040.

The previous prime is 4645721807. The next prime is 4645721819. The reversal of 4645721808 is 8081275464.

4645721808 is a `hidden beast` number, since 4 + 64 + 572 + 18 + 0 + 8 = 666.

It is a super-2 number, since 2×4645721808² = 43165462234653577728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4645721807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 532941 + ... + 541587.

Almost surely, 2^4645721808 is an apocalyptic number.

4645721808 is a gapful number since it is divisible by the number (48) 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 4645721808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8197058688).

4645721808 is an abundant number, since it is smaller than the sum of its proper divisors (11748395568).

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

4645721808 is a wasteful number, since it uses less digits than its factorization.

4645721808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8722 (or 8713 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 4645721808 is about 68159.5320406471. The cubic root of 4645721808 is about 1668.5954949828.

It can be divided in two parts, 46457 and 21808, that added together give a triangular number (68265 = T₃₆₉).

The spelling of 4645721808 in words is "four billion, six hundred forty-five million, seven hundred twenty-one thousand, eight hundred eight".