1620726144 has 256 divisors, whose sum is σ = 4891104000. Its totient is φ = 472449024.

The previous prime is 1620726137. The next prime is 1620726179. The reversal of 1620726144 is 4416270261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9054247 + ... + 9054425.

It is an arithmetic number, because the mean of its divisors is an integer number (19105875).

Almost surely, 2^1620726144 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 1620726144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2445552000).

1620726144 is an abundant number, since it is smaller than the sum of its proper divisors (3270377856).

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

1620726144 is a wasteful number, since it uses less digits than its factorization.

1620726144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 1620726144 is about 40258.2431807450. The cubic root of 1620726144 is about 1174.6357450057.

The spelling of 1620726144 in words is "one billion, six hundred twenty million, seven hundred twenty-six thousand, one hundred forty-four".