61889188 has 6 divisors (see below), whose sum is σ = 108306086. Its totient is φ = 30944592.

The previous prime is 61889147. The next prime is 61889189. The reversal of 61889188 is 88198816.

It can be written as a sum of positive squares in only one way, i.e., 36869184 + 25020004 = 6072^2 + 5002^2 .

It is not an unprimeable number, because it can be changed into a prime (61889189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7736145 + ... + 7736152.

Almost surely, 2^61889188 is an apocalyptic number.

It is an amenable number.

61889188 is a deficient number, since it is larger than the sum of its proper divisors (46416898).

61889188 is a wasteful number, since it uses less digits than its factorization.

61889188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15472301 (or 15472299 counting only the distinct ones).

The product of its digits is 221184, while the sum is 49.

The square root of 61889188 is about 7866.9681580645. The cubic root of 61889188 is about 395.5532236369.

It can be divided in two parts, 6188 and 9188, that added together give a square (15376 = 124²).

The spelling of 61889188 in words is "sixty-one million, eight hundred eighty-nine thousand, one hundred eighty-eight".