61539738 has 16 divisors (see below), whose sum is σ = 132547296. Its totient is φ = 18935280.

The previous prime is 61539713. The next prime is 61539757. The reversal of 61539738 is 83793516.

61539738 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 61539738.

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 7 ways as a sum of consecutive naturals, for example, 394408 + ... + 394563.

It is an arithmetic number, because the mean of its divisors is an integer number (8284206).

Almost surely, 2^61539738 is an apocalyptic number.

61539738 is an abundant number, since it is smaller than the sum of its proper divisors (71007558).

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

61539738 is a wasteful number, since it uses less digits than its factorization.

61539738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788989.

The product of its digits is 136080, while the sum is 42.

The square root of 61539738 is about 7844.7267638841. The cubic root of 61539738 is about 394.8073364757.

The spelling of 61539738 in words is "sixty-one million, five hundred thirty-nine thousand, seven hundred thirty-eight".