1620897600 has 336 divisors, whose sum is σ = 6399987200. Its totient is φ = 350853120.

The previous prime is 1620897587. The next prime is 1620897611. The reversal of 1620897600 is 67980261.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 637131 + ... + 639669.

Almost surely, 2^1620897600 is an apocalyptic number.

1620897600 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 1620897600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3199993600).

1620897600 is an abundant number, since it is smaller than the sum of its proper divisors (4779089600).

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

1620897600 is a wasteful number, since it uses less digits than its factorization.

1620897600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590 (or 2575 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 1620897600 is about 40260.3725765175. The cubic root of 1620897600 is about 1174.6771649674.

The spelling of 1620897600 in words is "one billion, six hundred twenty million, eight hundred ninety-seven thousand, six hundred".