50991866 has 4 divisors (see below), whose sum is σ = 76487802. Its totient is φ = 25495932.

The previous prime is 50991859. The next prime is 50991907. The reversal of 50991866 is 66819905.

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., 37515625 + 13476241 = 6125^2 + 3671^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12747965 + ... + 12747968.

Almost surely, 2^50991866 is an apocalyptic number.

50991866 is a deficient number, since it is larger than the sum of its proper divisors (25495936).

50991866 is a wasteful number, since it uses less digits than its factorization.

50991866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25495935.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 50991866 is about 7140.8589119237. The cubic root of 50991866 is about 370.8232606054.

The spelling of 50991866 in words is "fifty million, nine hundred ninety-one thousand, eight hundred sixty-six".