620647571 has 4 divisors (see below), whose sum is σ = 647632272. Its totient is φ = 593662872.

The previous prime is 620647537. The next prime is 620647591. The reversal of 620647571 is 175746026.

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 620647571 - 2⁶ = 620647507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620647501) 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, 13492316 + ... + 13492361.

It is an arithmetic number, because the mean of its divisors is an integer number (161908068).

Almost surely, 2^620647571 is an apocalyptic number.

620647571 is a deficient number, since it is larger than the sum of its proper divisors (26984701).

620647571 is a wasteful number, since it uses less digits than its factorization.

620647571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26984700.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 620647571 is about 24912.7993409011. The cubic root of 620647571 is about 852.9986686968.

The spelling of 620647571 in words is "six hundred twenty million, six hundred forty-seven thousand, five hundred seventy-one".