61089866 has 4 divisors (see below), whose sum is σ = 91634802. Its totient is φ = 30544932.

The previous prime is 61089859. The next prime is 61089869. The reversal of 61089866 is 66898016.

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., 58079641 + 3010225 = 7621^2 + 1735^2 .

It is not an unprimeable number, because it can be changed into a prime (61089869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15272465 + ... + 15272468.

Almost surely, 2^61089866 is an apocalyptic number.

61089866 is a deficient number, since it is larger than the sum of its proper divisors (30544936).

61089866 is a wasteful number, since it uses less digits than its factorization.

61089866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30544935.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 61089866 is about 7816.0006397134. Note that the first 3 decimals coincide. The cubic root of 61089866 is about 393.8429334348.

The spelling of 61089866 in words is "sixty-one million, eighty-nine thousand, eight hundred sixty-six".