1621013304 has 16 divisors (see below), whose sum is σ = 4052533320. Its totient is φ = 540337760.

The previous prime is 1621013267. The next prime is 1621013309. The reversal of 1621013304 is 4033101261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621013309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33771087 + ... + 33771134.

Almost surely, 2^1621013304 is an apocalyptic number.

It is an amenable number.

1621013304 is an abundant number, since it is smaller than the sum of its proper divisors (2431520016).

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

1621013304 is a wasteful number, since it uses less digits than its factorization.

1621013304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67542230 (or 67542226 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1621013304 is about 40261.8094973388. The cubic root of 1621013304 is about 1174.7051148336.

Adding to 1621013304 its reverse (4033101261), we get a palindrome (5654114565).

The spelling of 1621013304 in words is "one billion, six hundred twenty-one million, thirteen thousand, three hundred four".