620721670 has 8 divisors (see below), whose sum is σ = 1117299024. Its totient is φ = 248288664.

The previous prime is 620721653. The next prime is 620721679. The reversal of 620721670 is 76127026.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620721679) 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, 31036074 + ... + 31036093.

It is an arithmetic number, because the mean of its divisors is an integer number (139662378).

Almost surely, 2^620721670 is an apocalyptic number.

620721670 is a deficient number, since it is larger than the sum of its proper divisors (496577354).

620721670 is a wasteful number, since it uses less digits than its factorization.

620721670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62072174.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 620721670 is about 24914.2864637942. The cubic root of 620721670 is about 853.0326137976.

Adding to 620721670 its reverse (76127026), we get a palindrome (696848696).

The spelling of 620721670 in words is "six hundred twenty million, seven hundred twenty-one thousand, six hundred seventy".