1620616 has 8 divisors (see below), whose sum is σ = 3038670. Its totient is φ = 810304.

The previous prime is 1620613. The next prime is 1620617. The reversal of 1620616 is 6160261.

It can be written as a sum of positive squares in only one way, i.e., 1322500 + 298116 = 1150^2 + 546^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1620611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101281 + ... + 101296.

2^1620616 is an apocalyptic number.

It is an amenable number.

1620616 is a deficient number, since it is larger than the sum of its proper divisors (1418054).

1620616 is a wasteful number, since it uses less digits than its factorization.

1620616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202583 (or 202579 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1620616 is about 1273.0341707904. The cubic root of 1620616 is about 117.4609135120.

Adding to 1620616 its reverse (6160261), we get a palindrome (7780877).

The spelling of 1620616 in words is "one million, six hundred twenty thousand, six hundred sixteen".