1620934885920 has 192 divisors, whose sum is σ = 5849297556480. Its totient is φ = 369614834688.

The previous prime is 1620934885909. The next prime is 1620934885939. The reversal of 1620934885920 is 295884390261.

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, 832159 + ... + 1983521.

It is an arithmetic number, because the mean of its divisors is an integer number (30465091440).

Almost surely, 2^{1620934885920} is an apocalyptic number.

1620934885920 is a gapful number since it is divisible by the number (10) 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 1620934885920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2924648778240).

1620934885920 is an abundant number, since it is smaller than the sum of its proper divisors (4228362670560).

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

1620934885920 is a wasteful number, since it uses less digits than its factorization.

1620934885920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151807 (or 1151799 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 57.

The spelling of 1620934885920 in words is "one trillion, six hundred twenty billion, nine hundred thirty-four million, eight hundred eighty-five thousand, nine hundred twenty".