50891638 has 16 divisors (see below), whose sum is σ = 87371424. Its totient is φ = 21778560.

The previous prime is 50891611. The next prime is 50891641. The reversal of 50891638 is 83619805.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 50891638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8878 + ... + 13438.

It is an arithmetic number, because the mean of its divisors is an integer number (5460714).

Almost surely, 2^50891638 is an apocalyptic number.

50891638 is a deficient number, since it is larger than the sum of its proper divisors (36479786).

50891638 is a wasteful number, since it uses less digits than its factorization.

50891638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5367.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 50891638 is about 7133.8375366979. The cubic root of 50891638 is about 370.5801417536.

It can be divided in two parts, 50891 and 638, that added together give a square (51529 = 227²).

The spelling of 50891638 in words is "fifty million, eight hundred ninety-one thousand, six hundred thirty-eight".