1620744120 has 128 divisors (see below), whose sum is σ = 5411361600. Its totient is φ = 431488512.

The previous prime is 1620744109. The next prime is 1620744121. The reversal of 1620744120 is 214470261.

1620744120 is a `hidden beast` number, since 16 + 207 + 441 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620744121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1179754 + ... + 1181126.

Almost surely, 2^1620744120 is an apocalyptic number.

1620744120 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 1620744120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2705680800).

1620744120 is an abundant number, since it is smaller than the sum of its proper divisors (3790617480).

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

1620744120 is a wasteful number, since it uses less digits than its factorization.

1620744120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486 (or 2476 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 1620744120 is about 40258.4664387505. The cubic root of 1620744120 is about 1174.6400877451.

The spelling of 1620744120 in words is "one billion, six hundred twenty million, seven hundred forty-four thousand, one hundred twenty".