1620466321 has 8 divisors (see below), whose sum is σ = 1692945000. Its totient is φ = 1549094400.

The previous prime is 1620466313. The next prime is 1620466327. The reversal of 1620466321 is 1236640261.

It can be written as a sum of positive squares in 4 ways, for example, as 533841025 + 1086625296 = 23105^2 + 32964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1620466321 - 2³ = 1620466313 is a prime.

It is a super-2 number, since 2×1620466321² = 5251822194990550082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620466327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273696 + ... + 279553.

It is an arithmetic number, because the mean of its divisors is an integer number (211618125).

Almost surely, 2^1620466321 is an apocalyptic number.

It is an amenable number.

1620466321 is a deficient number, since it is larger than the sum of its proper divisors (72478679).

1620466321 is a wasteful number, since it uses less digits than its factorization.

1620466321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553379.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1620466321 is about 40255.0160973760. The cubic root of 1620466321 is about 1174.5729719713.

The spelling of 1620466321 in words is "one billion, six hundred twenty million, four hundred sixty-six thousand, three hundred twenty-one".