655830 has 64 divisors (see below), whose sum is σ = 2004480. Its totient is φ = 149472.

The previous prime is 655807. The next prime is 655847. The reversal of 655830 is 38556.

655830 is a `hidden beast` number, since 655 + 8 + 3 + 0 = 666.

It is a super-2 number, since 2×655830² = 860225977800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 655794 and 655803.

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, 1717 + ... + 2063.

It is an arithmetic number, because the mean of its divisors is an integer number (31320).

2⁶⁵⁵⁸³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1002240).

655830 is an abundant number, since it is smaller than the sum of its proper divisors (1348650).

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

655830 is a wasteful number, since it uses less digits than its factorization.

655830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 655830 is about 809.8333161830. The cubic root of 655830 is about 86.8821233570.

It can be divided in two parts, 655 and 830, that added together give a triangular number (1485 = T₅₄).

The spelling of 655830 in words is "six hundred fifty-five thousand, eight hundred thirty".