50778558 has 96 divisors (see below), whose sum is σ = 123731712. Its totient is φ = 14976000.

The previous prime is 50778551. The next prime is 50778649. The reversal of 50778558 is 85587705.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50778551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 502708 + ... + 502808.

It is an arithmetic number, because the mean of its divisors is an integer number (1288872).

Almost surely, 2^50778558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 50778558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61865856).

50778558 is an abundant number, since it is smaller than the sum of its proper divisors (72953154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

50778558 is a wasteful number, since it uses less digits than its factorization.

50778558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 392000, while the sum is 45.

The square root of 50778558 is about 7125.9075211513. The cubic root of 50778558 is about 370.3054648132.

The spelling of 50778558 in words is "fifty million, seven hundred seventy-eight thousand, five hundred fifty-eight".