61377558 has 16 divisors (see below), whose sum is σ = 133914816. Its totient is φ = 18599240.

The previous prime is 61377553. The next prime is 61377571. The reversal of 61377558 is 85577316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61377553) 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 7 ways as a sum of consecutive naturals, for example, 464916 + ... + 465047.

It is an arithmetic number, because the mean of its divisors is an integer number (8369676).

Almost surely, 2^61377558 is an apocalyptic number.

61377558 is an abundant number, since it is smaller than the sum of its proper divisors (72537258).

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

61377558 is a wasteful number, since it uses less digits than its factorization.

61377558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929979.

The product of its digits is 176400, while the sum is 42.

The square root of 61377558 is about 7834.3830644155. The cubic root of 61377558 is about 394.4602101805.

It can be divided in two parts, 6137 and 7558, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 61377558 in words is "sixty-one million, three hundred seventy-seven thousand, five hundred fifty-eight".