646860 has 24 divisors (see below), whose sum is σ = 1811376. Its totient is φ = 172480.

The previous prime is 646859. The next prime is 646873. The reversal of 646860 is 68646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5331 + ... + 5450.

It is an arithmetic number, because the mean of its divisors is an integer number (75474).

2⁶⁴⁶⁸⁶⁰ is an apocalyptic number.

646860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646860 is an abundant number, since it is smaller than the sum of its proper divisors (1164516).

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

646860 is a wasteful number, since it uses less digits than its factorization.

646860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10793 (or 10791 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 646860 is about 804.2760720051. The cubic root of 646860 is about 86.4841986128.

The spelling of 646860 in words is "six hundred forty-six thousand, eight hundred sixty".