620602128721 has 4 divisors (see below), whose sum is σ = 620605343232. Its totient is φ = 620598914212.

The previous prime is 620602128709. The next prime is 620602128743. The reversal of 620602128721 is 127821206026.

It is a happy number.

620602128721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 620602128721 - 2¹³ = 620602120529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620602125721) 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, 1297801 + ... + 1710406.

It is an arithmetic number, because the mean of its divisors is an integer number (155151335808).

Almost surely, 2^620602128721 is an apocalyptic number.

It is an amenable number.

620602128721 is a deficient number, since it is larger than the sum of its proper divisors (3214511).

620602128721 is a wasteful number, since it uses less digits than its factorization.

620602128721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214510.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 620602128721 in words is "six hundred twenty billion, six hundred two million, one hundred twenty-eight thousand, seven hundred twenty-one".