620215643 has 4 divisors (see below), whose sum is σ = 620541768. Its totient is φ = 619889520.

The previous prime is 620215597. The next prime is 620215697. The reversal of 620215643 is 346512026.

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 620215643 - 2¹⁶ = 620150107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620415643) 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, 160193 + ... + 164018.

It is an arithmetic number, because the mean of its divisors is an integer number (155135442).

Almost surely, 2^620215643 is an apocalyptic number.

620215643 is a deficient number, since it is larger than the sum of its proper divisors (326125).

620215643 is a wasteful number, since it uses less digits than its factorization.

620215643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326124.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 620215643 is about 24904.1290351620. The cubic root of 620215643 is about 852.8007466514.

Adding to 620215643 its reverse (346512026), we get a palindrome (966727669).

The spelling of 620215643 in words is "six hundred twenty million, two hundred fifteen thousand, six hundred forty-three".