1620642363 has 4 divisors (see below), whose sum is σ = 2160856488. Its totient is φ = 1080428240.

The previous prime is 1620642349. The next prime is 1620642407. The reversal of 1620642363 is 3632460261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1620642363 - 2⁴ = 1620642347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620642343) 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 3 ways as a sum of consecutive naturals, for example, 270107058 + ... + 270107063.

It is an arithmetic number, because the mean of its divisors is an integer number (540214122).

Almost surely, 2^1620642363 is an apocalyptic number.

1620642363 is a deficient number, since it is larger than the sum of its proper divisors (540214125).

1620642363 is an equidigital number, since it uses as much as digits as its factorization.

1620642363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540214124.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 1620642363 is about 40257.2026226364. The cubic root of 1620642363 is about 1174.6155043143.

The spelling of 1620642363 in words is "one billion, six hundred twenty million, six hundred forty-two thousand, three hundred sixty-three".