61605558 has 48 divisors (see below), whose sum is σ = 155151360. Its totient is φ = 17301168.

The previous prime is 61605553. The next prime is 61605559. The reversal of 61605558 is 85550616.

61605558 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×61605558³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61605553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3291 + ... + 11577.

It is an arithmetic number, because the mean of its divisors is an integer number (3232320).

Almost surely, 2^61605558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61605558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77575680).

61605558 is an abundant number, since it is smaller than the sum of its proper divisors (93545802).

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

61605558 is a wasteful number, since it uses less digits than its factorization.

61605558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8361 (or 8358 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 61605558 is about 7848.9208175392. The cubic root of 61605558 is about 394.9480420896.

The spelling of 61605558 in words is "sixty-one million, six hundred five thousand, five hundred fifty-eight".