620621069 has 4 divisors (see below), whose sum is σ = 622642944. Its totient is φ = 618599196.

The previous prime is 620621009. The next prime is 620621123. The reversal of 620621069 is 960126026.

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 not a de Polignac number, because 620621069 - 2²⁰ = 619572493 is a prime.

It is a super-2 number, since 2×620621069² = 770341022573405522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620621009) 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, 1010477 + ... + 1011090.

It is an arithmetic number, because the mean of its divisors is an integer number (155660736).

Almost surely, 2^620621069 is an apocalyptic number.

It is an amenable number.

620621069 is a deficient number, since it is larger than the sum of its proper divisors (2021875).

620621069 is a wasteful number, since it uses less digits than its factorization.

620621069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021874.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 620621069 is about 24912.2674399582. The cubic root of 620621069 is about 852.9865273499.

The spelling of 620621069 in words is "six hundred twenty million, six hundred twenty-one thousand, sixty-nine".