620449686 has 64 divisors (see below), whose sum is σ = 1429401600. Its totient is φ = 199281600.

The previous prime is 620449673. The next prime is 620449699. The reversal of 620449686 is 686944026.

It is an interprime number because it is at equal distance from previous prime (620449673) and next prime (620449699).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 469735 + ... + 471053.

It is an arithmetic number, because the mean of its divisors is an integer number (22334400).

Almost surely, 2^620449686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620449686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (714700800).

620449686 is an abundant number, since it is smaller than the sum of its proper divisors (808951914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

620449686 is a wasteful number, since it uses less digits than its factorization.

620449686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 620449686 is about 24908.8274714006. The cubic root of 620449686 is about 852.9080034025.

The spelling of 620449686 in words is "six hundred twenty million, four hundred forty-nine thousand, six hundred eighty-six".