620505987 has 4 divisors (see below), whose sum is σ = 827341320. Its totient is φ = 413670656.

The previous prime is 620505973. The next prime is 620505989. The reversal of 620505987 is 789505026.

620505987 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.

It is a cyclic number.

It is not a de Polignac number, because 620505987 - 2⁷ = 620505859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (620505989) 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, 103417662 + ... + 103417667.

It is an arithmetic number, because the mean of its divisors is an integer number (206835330).

Almost surely, 2^620505987 is an apocalyptic number.

620505987 is a deficient number, since it is larger than the sum of its proper divisors (206835333).

620505987 is a wasteful number, since it uses less digits than its factorization.

620505987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206835332.

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 620505987 is about 24909.9575872782. The cubic root of 620505987 is about 852.9338008857.

The spelling of 620505987 in words is "six hundred twenty million, five hundred five thousand, nine hundred eighty-seven".