61605404 has 12 divisors (see below), whose sum is σ = 123210864. Its totient is φ = 26402304.

The previous prime is 61605403. The next prime is 61605409. The reversal of 61605404 is 40450616.

It is a happy number.

61605404 is an admirable number.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61605403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1100069 + ... + 1100124.

It is an arithmetic number, because the mean of its divisors is an integer number (10267572).

Almost surely, 2^61605404 is an apocalyptic number.

It is an amenable number.

61605404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61605404 is a wasteful number, since it uses less digits than its factorization.

61605404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200204 (or 2200202 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 61605404 is about 7848.9110072672. The cubic root of 61605404 is about 394.9477129956.

The spelling of 61605404 in words is "sixty-one million, six hundred five thousand, four hundred four".