661076 has 12 divisors (see below), whose sum is σ = 1245972. Its totient is φ = 305088.

The previous prime is 661061. The next prime is 661091. The reversal of 661076 is 670166.

It is an interprime number because it is at equal distance from previous prime (661061) and next prime (661091).

It can be written as a sum of positive squares in 2 ways, for example, as 384400 + 276676 = 620^2 + 526^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 661076.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6305 + ... + 6408.

It is an arithmetic number, because the mean of its divisors is an integer number (103831).

2⁶⁶¹⁰⁷⁶ is an apocalyptic number.

It is an amenable number.

661076 is a deficient number, since it is larger than the sum of its proper divisors (584896).

661076 is a wasteful number, since it uses less digits than its factorization.

661076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12730 (or 12728 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 661076 is about 813.0658029951. The cubic root of 661076 is about 87.1131658103.

The spelling of 661076 in words is "six hundred sixty-one thousand, seventy-six".