620641153 has 4 divisors (see below), whose sum is σ = 677063088. Its totient is φ = 564219220.

The previous prime is 620641139. The next prime is 620641181. The reversal of 620641153 is 351146026.

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 a de Polignac number, because none of the positive numbers 2^k-620641153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620641103) 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, 28210951 + ... + 28210972.

It is an arithmetic number, because the mean of its divisors is an integer number (169265772).

Almost surely, 2^620641153 is an apocalyptic number.

It is an amenable number.

620641153 is a deficient number, since it is larger than the sum of its proper divisors (56421935).

620641153 is a wasteful number, since it uses less digits than its factorization.

620641153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56421934.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 620641153 is about 24912.6705312779. The cubic root of 620641153 is about 852.9957284537.

Adding to 620641153 its reverse (351146026), we get a palindrome (971787179).

The spelling of 620641153 in words is "six hundred twenty million, six hundred forty-one thousand, one hundred fifty-three".