620749 has 8 divisors (see below), whose sum is σ = 671840. Its totient is φ = 571536.

The previous prime is 620743. The next prime is 620759. The reversal of 620749 is 947026.

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 620749 - 2⁵ = 620717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262 + ... + 1144.

It is an arithmetic number, because the mean of its divisors is an integer number (83980).

2⁶²⁰⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

620749 is a deficient number, since it is larger than the sum of its proper divisors (51091).

620749 is a wasteful number, since it uses less digits than its factorization.

620749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 620749 is about 787.8762593200. The cubic root of 620749 is about 85.3045133117.

It can be divided in two parts, 620 and 749, that added together give a square (1369 = 37²).

The spelling of 620749 in words is "six hundred twenty thousand, seven hundred forty-nine".