61604 has 6 divisors (see below), whose sum is σ = 107814. Its totient is φ = 30800.

The previous prime is 61603. The next prime is 61609. The reversal of 61604 is 40616.

It can be written as a sum of positive squares in only one way, i.e., 61504 + 100 = 248^2 + 10^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (61603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7697 + ... + 7704.

It is an arithmetic number, because the mean of its divisors is an integer number (17969).

2⁶¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

61604 is a deficient number, since it is larger than the sum of its proper divisors (46210).

61604 is a wasteful number, since it uses less digits than its factorization.

61604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15405 (or 15403 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 61604 is about 248.2015310186. The cubic root of 61604 is about 39.4944712659.

The spelling of 61604 in words is "sixty-one thousand, six hundred four".