620718506 has 4 divisors (see below), whose sum is σ = 931077762. Its totient is φ = 310359252.

The previous prime is 620718499. The next prime is 620718517. The reversal of 620718506 is 605817026.

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

It can be written as a sum of positive squares in only one way, i.e., 592192225 + 28526281 = 24335^2 + 5341^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155179625 + ... + 155179628.

Almost surely, 2^620718506 is an apocalyptic number.

620718506 is a deficient number, since it is larger than the sum of its proper divisors (310359256).

620718506 is a wasteful number, since it uses less digits than its factorization.

620718506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310359255.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 620718506 is about 24914.2229660088. Note that the first 3 decimals coincide. The cubic root of 620718506 is about 853.0311644096.

The spelling of 620718506 in words is "six hundred twenty million, seven hundred eighteen thousand, five hundred six".