661024 has 48 divisors (see below), whose sum is σ = 1608768. Its totient is φ = 260352.

The previous prime is 661019. The next prime is 661027. The reversal of 661024 is 420166.

It is a junction number, because it is equal to n+sod(n) for n = 660992 and 661010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2799 + ... + 3025.

It is an arithmetic number, because the mean of its divisors is an integer number (33516).

2⁶⁶¹⁰²⁴ 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 661024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804384).

661024 is an abundant number, since it is smaller than the sum of its proper divisors (947744).

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

661024 is a wasteful number, since it uses less digits than its factorization.

661024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 661024 is about 813.0338246346. The cubic root of 661024 is about 87.1108816536.

The spelling of 661024 in words is "six hundred sixty-one thousand, twenty-four".