50991604 has 6 divisors (see below), whose sum is σ = 89235314. Its totient is φ = 25495800.

The previous prime is 50991601. The next prime is 50991607. The reversal of 50991604 is 40619905.

It is an interprime number because it is at equal distance from previous prime (50991601) and next prime (50991607).

It can be written as a sum of positive squares in only one way, i.e., 47196900 + 3794704 = 6870^2 + 1948^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 50991604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50991601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6373947 + ... + 6373954.

Almost surely, 2^50991604 is an apocalyptic number.

It is an amenable number.

50991604 is a deficient number, since it is larger than the sum of its proper divisors (38243710).

50991604 is a wasteful number, since it uses less digits than its factorization.

50991604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12747905 (or 12747903 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 50991604 is about 7140.8405667680. The cubic root of 50991604 is about 370.8226254984.

The spelling of 50991604 in words is "fifty million, nine hundred ninety-one thousand, six hundred four".