620721669 has 8 divisors (see below), whose sum is σ = 827809632. Its totient is φ = 413724080.

The previous prime is 620721653. The next prime is 620721679. The reversal of 620721669 is 966127026.

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

It is a cyclic number.

It is not a de Polignac number, because 620721669 - 2⁴ = 620721653 is a prime.

It is a super-2 number, since 2×620721669² = 770590780732291122, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 4494 + ... + 35519.

It is an arithmetic number, because the mean of its divisors is an integer number (103476204).

Almost surely, 2^620721669 is an apocalyptic number.

It is an amenable number.

620721669 is a deficient number, since it is larger than the sum of its proper divisors (207087963).

620721669 is a wasteful number, since it uses less digits than its factorization.

620721669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45187.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 620721669 is about 24914.2864437254. The cubic root of 620721669 is about 853.0326133396.

The spelling of 620721669 in words is "six hundred twenty million, seven hundred twenty-one thousand, six hundred sixty-nine".