61557188 has 96 divisors (see below), whose sum is σ = 144399360. Its totient is φ = 22239360.

The previous prime is 61557173. The next prime is 61557191. The reversal of 61557188 is 88175516.

61557188 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 392006 + ... + 392162.

It is an arithmetic number, because the mean of its divisors is an integer number (1504160).

Almost surely, 2^61557188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61557188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72199680).

61557188 is an abundant number, since it is smaller than the sum of its proper divisors (82842172).

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

61557188 is a wasteful number, since it uses less digits than its factorization.

61557188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 263 counting only the distinct ones).

The product of its digits is 67200, while the sum is 41.

The square root of 61557188 is about 7845.8388971480. The cubic root of 61557188 is about 394.8446496935.

The spelling of 61557188 in words is "sixty-one million, five hundred fifty-seven thousand, one hundred eighty-eight".