61539558 has 32 divisors (see below), whose sum is σ = 130654944. Its totient is φ = 19256832.

The previous prime is 61539553. The next prime is 61539581. The reversal of 61539558 is 85593516.

61539558 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61539553) 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 15 ways as a sum of consecutive naturals, for example, 76816 + ... + 77612.

It is an arithmetic number, because the mean of its divisors is an integer number (4082967).

Almost surely, 2^61539558 is an apocalyptic number.

61539558 is an abundant number, since it is smaller than the sum of its proper divisors (69115386).

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

61539558 is a wasteful number, since it uses less digits than its factorization.

61539558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576.

The product of its digits is 162000, while the sum is 42.

The square root of 61539558 is about 7844.7152912008. The cubic root of 61539558 is about 394.8069515461.

The spelling of 61539558 in words is "sixty-one million, five hundred thirty-nine thousand, five hundred fifty-eight".