1620388800 has 210 divisors, whose sum is σ = 5956618008. Its totient is φ = 432069120.

The previous prime is 1620388787. The next prime is 1620388843. The reversal of 1620388800 is 88830261.

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 polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 123349 + ... + 135851.

Almost surely, 2^1620388800 is an apocalyptic number.

1620388800 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 1620388800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2978309004).

1620388800 is an abundant number, since it is smaller than the sum of its proper divisors (4336229208).

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

1620388800 is a wasteful number, since it uses less digits than its factorization.

1620388800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12537 (or 12513 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 1620388800 is about 40254.0532120680. The cubic root of 1620388800 is about 1174.5542416585.

The spelling of 1620388800 in words is "one billion, six hundred twenty million, three hundred eighty-eight thousand, eight hundred".