1620047044 has 96 divisors (see below), whose sum is σ = 3741437952. Its totient is φ = 595056000.

The previous prime is 1620047041. The next prime is 1620047071. The reversal of 1620047044 is 4407400261.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1620047041) 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, 501354 + ... + 504574.

It is an arithmetic number, because the mean of its divisors is an integer number (38973312).

Almost surely, 2^1620047044 is an apocalyptic number.

1620047044 is a gapful number since it is divisible by the number (14) 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 1620047044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1870718976).

1620047044 is an abundant number, since it is smaller than the sum of its proper divisors (2121390908).

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

1620047044 is a wasteful number, since it uses less digits than its factorization.

1620047044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3337 (or 3335 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 1620047044 is about 40249.8079995421. The cubic root of 1620047044 is about 1174.4716608229.

The spelling of 1620047044 in words is "one billion, six hundred twenty million, forty-seven thousand, forty-four".