61775138 has 4 divisors (see below), whose sum is σ = 92662710. Its totient is φ = 30887568.

The previous prime is 61775123. The next prime is 61775143. The reversal of 61775138 is 83157716.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 58874929 + 2900209 = 7673^2 + 1703^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15443783 + ... + 15443786.

Almost surely, 2^61775138 is an apocalyptic number.

61775138 is a deficient number, since it is larger than the sum of its proper divisors (30887572).

61775138 is a wasteful number, since it uses less digits than its factorization.

61775138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30887571.

The product of its digits is 35280, while the sum is 38.

The square root of 61775138 is about 7859.7161526355. The cubic root of 61775138 is about 395.3100977831.

The spelling of 61775138 in words is "sixty-one million, seven hundred seventy-five thousand, one hundred thirty-eight".