661848 has 64 divisors (see below), whose sum is σ = 1900800. Its totient is φ = 190080.

The previous prime is 661823. The next prime is 661849. The reversal of 661848 is 848166.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6018 + ... + 6126.

It is an arithmetic number, because the mean of its divisors is an integer number (29700).

2⁶⁶¹⁸⁴⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (950400).

661848 is an abundant number, since it is smaller than the sum of its proper divisors (1238952).

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

661848 is a wasteful number, since it uses less digits than its factorization.

661848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 148 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 661848 is about 813.5404107972. The cubic root of 661848 is about 87.1470626706.

It can be divided in two parts, 6618 and 48, that added together give a palindrome (6666).

The spelling of 661848 in words is "six hundred sixty-one thousand, eight hundred forty-eight".