1620628 has 6 divisors (see below), whose sum is σ = 2836106. Its totient is φ = 810312.

The previous prime is 1620617. The next prime is 1620629. The reversal of 1620628 is 8260261.

It can be written as a sum of positive squares in only one way, i.e., 1119364 + 501264 = 1058^2 + 708^2 .

It is a super-2 number, since 2×1620628² = 5252870228768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202575 + ... + 202582.

2^1620628 is an apocalyptic number.

It is an amenable number.

1620628 is a deficient number, since it is larger than the sum of its proper divisors (1215478).

1620628 is a wasteful number, since it uses less digits than its factorization.

1620628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405161 (or 405159 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1620628 is about 1273.0388839309. The cubic root of 1620628 is about 117.4612034280.

Adding to 1620628 its reverse (8260261), we get a palindrome (9880889).

The spelling of 1620628 in words is "one million, six hundred twenty thousand, six hundred twenty-eight".