620641929 has 4 divisors (see below), whose sum is σ = 827522576. Its totient is φ = 413761284.

The previous prime is 620641907. The next prime is 620641943. The reversal of 620641929 is 929146026.

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 not a de Polignac number, because 620641929 - 2¹¹ = 620639881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620641429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103440319 + ... + 103440324.

It is an arithmetic number, because the mean of its divisors is an integer number (206880644).

Almost surely, 2^620641929 is an apocalyptic number.

It is an amenable number.

620641929 is a deficient number, since it is larger than the sum of its proper divisors (206880647).

620641929 is a wasteful number, since it uses less digits than its factorization.

620641929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206880646.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 620641929 is about 24912.6861056772. The cubic root of 620641929 is about 852.9960839594.

The spelling of 620641929 in words is "six hundred twenty million, six hundred forty-one thousand, nine hundred twenty-nine".