1321616028 has 24 divisors (see below), whose sum is σ = 3095503488. Its totient is φ = 438862576.

The previous prime is 1321615993. The next prime is 1321616033. The reversal of 1321616028 is 8206161231.

It is a junction number, because it is equal to n+sod(n) for n = 1321615986 and 1321616004.

It is a congruent number.

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, 206226 + ... + 212537.

It is an arithmetic number, because the mean of its divisors is an integer number (128979312).

Almost surely, 2^1321616028 is an apocalyptic number.

It is an amenable number.

1321616028 is an abundant number, since it is smaller than the sum of its proper divisors (1773887460).

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

1321616028 is a wasteful number, since it uses less digits than its factorization.

1321616028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419033 (or 419031 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1321616028 is about 36354.0372998653. The cubic root of 1321616028 is about 1097.4087845417.

Adding to 1321616028 its reverse (8206161231), we get a palindrome (9527777259).

The spelling of 1321616028 in words is "one billion, three hundred twenty-one million, six hundred sixteen thousand, twenty-eight".