1620264244 has 6 divisors (see below), whose sum is σ = 2835462434. Its totient is φ = 810132120.

The previous prime is 1620264241. The next prime is 1620264251. The reversal of 1620264244 is 4424620261.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1520064144 + 100200100 = 38988^2 + 10010^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620264241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202533027 + ... + 202533034.

Almost surely, 2^1620264244 is an apocalyptic number.

It is an amenable number.

1620264244 is a deficient number, since it is larger than the sum of its proper divisors (1215198190).

1620264244 is a wasteful number, since it uses less digits than its factorization.

1620264244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405066065 (or 405066063 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 1620264244 is about 40252.5060586294. The cubic root of 1620264244 is about 1174.5241456867.

The spelling of 1620264244 in words is "one billion, six hundred twenty million, two hundred sixty-four thousand, two hundred forty-four".