1620044463 has 4 divisors (see below), whose sum is σ = 2160059288. Its totient is φ = 1080029640.

The previous prime is 1620044441. The next prime is 1620044467. The reversal of 1620044463 is 3644400261.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1620044463 - 2²¹ = 1617947311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1620044463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620044467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270007408 + ... + 270007413.

It is an arithmetic number, because the mean of its divisors is an integer number (540014822).

Almost surely, 2^1620044463 is an apocalyptic number.

1620044463 is a deficient number, since it is larger than the sum of its proper divisors (540014825).

1620044463 is an equidigital number, since it uses as much as digits as its factorization.

1620044463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540014824.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 1620044463 is about 40249.7759372645. The cubic root of 1620044463 is about 1174.4710371141.

The spelling of 1620044463 in words is "one billion, six hundred twenty million, forty-four thousand, four hundred sixty-three".