1620923520 has 256 divisors, whose sum is σ = 5397840000. Its totient is φ = 413368320.

The previous prime is 1620923509. The next prime is 1620923587. The reversal of 1620923520 is 253290261.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 4644306 + ... + 4644654.

Almost surely, 2^1620923520 is an apocalyptic number.

1620923520 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 1620923520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2698920000).

1620923520 is an abundant number, since it is smaller than the sum of its proper divisors (3776916480).

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

1620923520 is a wasteful number, since it uses less digits than its factorization.

1620923520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1620923520 is about 40260.6944798522. The cubic root of 1620923520 is about 1174.6834264096.

The spelling of 1620923520 in words is "one billion, six hundred twenty million, nine hundred twenty-three thousand, five hundred twenty".