620643567 has 4 divisors (see below), whose sum is σ = 827524760. Its totient is φ = 413762376.

The previous prime is 620643563. The next prime is 620643593. The reversal of 620643567 is 765346026.

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

It is not a de Polignac number, because 620643567 - 2² = 620643563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620643563) 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, 103440592 + ... + 103440597.

It is an arithmetic number, because the mean of its divisors is an integer number (206881190).

Almost surely, 2^620643567 is an apocalyptic number.

620643567 is a deficient number, since it is larger than the sum of its proper divisors (206881193).

620643567 is a wasteful number, since it uses less digits than its factorization.

620643567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206881192.

The product of its (nonzero) digits is 181440, while the sum is 39.

The square root of 620643567 is about 24912.7189804726. The cubic root of 620643567 is about 852.9968343686.

The spelling of 620643567 in words is "six hundred twenty million, six hundred forty-three thousand, five hundred sixty-seven".