61889018 has 4 divisors (see below), whose sum is σ = 92833530. Its totient is φ = 30944508.

The previous prime is 61888999. The next prime is 61889059. The reversal of 61889018 is 81098816.

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., 37613689 + 24275329 = 6133^2 + 4927^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15472253 + ... + 15472256.

Almost surely, 2^61889018 is an apocalyptic number.

61889018 is a deficient number, since it is larger than the sum of its proper divisors (30944512).

61889018 is a wasteful number, since it uses less digits than its factorization.

61889018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30944511.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 61889018 is about 7866.9573533864. The cubic root of 61889018 is about 395.5528614622.

The spelling of 61889018 in words is "sixty-one million, eight hundred eighty-nine thousand, eighteen".