620990 has 8 divisors (see below), whose sum is σ = 1117800. Its totient is φ = 248392.

The previous prime is 620981. The next prime is 620999. The reversal of 620990 is 99026.

It is an interprime number because it is at equal distance from previous prime (620981) and next prime (620999).

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

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 620990.

It is not an unprimeable number, because it can be changed into a prime (620999) by changing a digit.

620990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31040 + ... + 31059.

It is an arithmetic number, because the mean of its divisors is an integer number (139725).

2⁶²⁰⁹⁹⁰ is an apocalyptic number.

620990 is a deficient number, since it is larger than the sum of its proper divisors (496810).

620990 is a wasteful number, since it uses less digits than its factorization.

620990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62106.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 620990 is about 788.0291872767. The cubic root of 620990 is about 85.3155514435.

The spelling of 620990 in words is "six hundred twenty thousand, nine hundred ninety".