61557538 has 16 divisors (see below), whose sum is σ = 106554240. Its totient is φ = 26125056.

The previous prime is 61557533. The next prime is 61557547. The reversal of 61557538 is 83575516.

61557538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 61557538.

It is not an unprimeable number, because it can be changed into a prime (61557533) 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 7 ways as a sum of consecutive naturals, for example, 19903 + ... + 22786.

It is an arithmetic number, because the mean of its divisors is an integer number (6659640).

Almost surely, 2^61557538 is an apocalyptic number.

61557538 is a deficient number, since it is larger than the sum of its proper divisors (44996702).

61557538 is a wasteful number, since it uses less digits than its factorization.

61557538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42801.

The product of its digits is 126000, while the sum is 40.

The square root of 61557538 is about 7845.8612019332. The cubic root of 61557538 is about 394.8453980240.

The spelling of 61557538 in words is "sixty-one million, five hundred fifty-seven thousand, five hundred thirty-eight".