685450620 has 96 divisors (see below), whose sum is σ = 2144600640. Its totient is φ = 181751040.

The previous prime is 685450589. The next prime is 685450651. The reversal of 685450620 is 26054586.

It is an interprime number because it is at equal distance from previous prime (685450589) and next prime (685450651).

It is a super-3 number, since 3×685450620³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 94234 + ... + 101246.

It is an arithmetic number, because the mean of its divisors is an integer number (22339590).

Almost surely, 2^685450620 is an apocalyptic number.

685450620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685450620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072300320).

685450620 is an abundant number, since it is smaller than the sum of its proper divisors (1459150020).

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

685450620 is a wasteful number, since it uses less digits than its factorization.

685450620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7212 (or 7204 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 685450620 is about 26181.1118938826. Note that the first 3 decimals coincide. The cubic root of 685450620 is about 881.7092382312.

The spelling of 685450620 in words is "six hundred eighty-five million, four hundred fifty thousand, six hundred twenty".