1620395285 has 4 divisors (see below), whose sum is σ = 1944474348. Its totient is φ = 1296316224.

The previous prime is 1620395233. The next prime is 1620395347. The reversal of 1620395285 is 5825930261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 534626884 + 1085768401 = 23122^2 + 32951^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620395285 - 2¹⁰ = 1620394261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162039524 + ... + 162039533.

It is an arithmetic number, because the mean of its divisors is an integer number (486118587).

Almost surely, 2^1620395285 is an apocalyptic number.

It is an amenable number.

1620395285 is a deficient number, since it is larger than the sum of its proper divisors (324079063).

1620395285 is an equidigital number, since it uses as much as digits as its factorization.

1620395285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324079062.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 1620395285 is about 40254.1337628820. The cubic root of 1620395285 is about 1174.5558085611. Note that the first 3 decimals are identical.

The spelling of 1620395285 in words is "one billion, six hundred twenty million, three hundred ninety-five thousand, two hundred eighty-five".