1620763385 has 8 divisors (see below), whose sum is σ = 1946612736. Its totient is φ = 1295479600.

The previous prime is 1620763349. The next prime is 1620763387. The reversal of 1620763385 is 5833670261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1620763385 - 2²⁴ = 1603986169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620763387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135059 + ... + 146568.

It is an arithmetic number, because the mean of its divisors is an integer number (243326592).

Almost surely, 2^1620763385 is an apocalyptic number.

It is an amenable number.

1620763385 is a deficient number, since it is larger than the sum of its proper divisors (325849351).

1620763385 is a wasteful number, since it uses less digits than its factorization.

1620763385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282783.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 1620763385 is about 40258.7057044809. The cubic root of 1620763385 is about 1174.6447418525.

The spelling of 1620763385 in words is "one billion, six hundred twenty million, seven hundred sixty-three thousand, three hundred eighty-five".