661078 has 16 divisors (see below), whose sum is σ = 1094400. Its totient is φ = 297000.

The previous prime is 661061. The next prime is 661091. The reversal of 661078 is 870166.

It is a congruent number.

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, 3223 + ... + 3421.

It is an arithmetic number, because the mean of its divisors is an integer number (68400).

2⁶⁶¹⁰⁷⁸ is an apocalyptic number.

661078 is a deficient number, since it is larger than the sum of its proper divisors (433322).

661078 is a wasteful number, since it uses less digits than its factorization.

661078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 661078 is about 813.0670329069. The cubic root of 661078 is about 87.1132536601.

The spelling of 661078 in words is "six hundred sixty-one thousand, seventy-eight".