620691 has 4 divisors (see below), whose sum is σ = 827592. Its totient is φ = 413792.

The previous prime is 620689. The next prime is 620693. The reversal of 620691 is 196026.

620691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (620689) and next prime (620693).

It is a cyclic number.

It is not a de Polignac number, because 620691 - 2¹ = 620689 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (620693) 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, 103446 + ... + 103451.

It is an arithmetic number, because the mean of its divisors is an integer number (206898).

2⁶²⁰⁶⁹¹ is an apocalyptic number.

620691 is a deficient number, since it is larger than the sum of its proper divisors (206901).

620691 is a wasteful number, since it uses less digits than its factorization.

620691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206900.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 620691 is about 787.8394506497. The cubic root of 620691 is about 85.3018564054.

The spelling of 620691 in words is "six hundred twenty thousand, six hundred ninety-one".