1620744800 has 72 divisors (see below), whose sum is σ = 3972542616. Its totient is φ = 645693440.

The previous prime is 1620744751. The next prime is 1620744817. The reversal of 1620744800 is 84470261.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201659 + ... + 209541.

It is an arithmetic number, because the mean of its divisors is an integer number (55174203).

Almost surely, 2^1620744800 is an apocalyptic number.

1620744800 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 1620744800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1986271308).

1620744800 is an abundant number, since it is smaller than the sum of its proper divisors (2351797816).

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

1620744800 is a wasteful number, since it uses less digits than its factorization.

1620744800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8160 (or 8147 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 1620744800 is about 40258.4748841781. The cubic root of 1620744800 is about 1174.6402520226.

The spelling of 1620744800 in words is "one billion, six hundred twenty million, seven hundred forty-four thousand, eight hundred".