1620201612 has 24 divisors (see below), whose sum is σ = 3805510912. Its totient is φ = 536490000.

The previous prime is 1620201607. The next prime is 1620201623. The reversal of 1620201612 is 2161020261.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445264 + ... + 448887.

Almost surely, 2^1620201612 is an apocalyptic number.

1620201612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1620201612 is an abundant number, since it is smaller than the sum of its proper divisors (2185309300).

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

1620201612 is a wasteful number, since it uses less digits than its factorization.

1620201612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894309 (or 894307 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1620201612 is about 40251.7280622832. The cubic root of 1620201612 is about 1174.5090115824.

Adding to 1620201612 its reverse (2161020261), we get a palindrome (3781221873).

The spelling of 1620201612 in words is "one billion, six hundred twenty million, two hundred one thousand, six hundred twelve".