616840 has 32 divisors (see below), whose sum is σ = 1586880. Its totient is φ = 211392.

The previous prime is 616829. The next prime is 616841. The reversal of 616840 is 48616.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (616841) by changing a digit.

616840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822 + ... + 1381.

It is an arithmetic number, because the mean of its divisors is an integer number (49590).

2⁶¹⁶⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

616840 is an abundant number, since it is smaller than the sum of its proper divisors (970040).

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

616840 is a wasteful number, since it uses less digits than its factorization.

616840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221 (or 2217 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 616840 is about 785.3916220587. The cubic root of 616840 is about 85.1250753800.

The spelling of 616840 in words is "six hundred sixteen thousand, eight hundred forty".