61604105440 has 48 divisors (see below), whose sum is σ = 147175010640. Its totient is φ = 24364764160.

The previous prime is 61604105401. The next prime is 61604105443. The reversal of 61604105440 is 4450140616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61604105443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2148826 + ... + 2177305.

It is an arithmetic number, because the mean of its divisors is an integer number (3066146055).

Almost surely, 2^61604105440 is an apocalyptic number.

It is an amenable number.

61604105440 is an abundant number, since it is smaller than the sum of its proper divisors (85570905200).

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

61604105440 is a wasteful number, since it uses less digits than its factorization.

61604105440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4326235 (or 4326227 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 61604105440 in words is "sixty-one billion, six hundred four million, one hundred five thousand, four hundred forty".