49640778 has 48 divisors (see below), whose sum is σ = 117936000. Its totient is φ = 14965440.

The previous prime is 49640761. The next prime is 49640839. The reversal of 49640778 is 87704694.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46798 + ... + 47846.

It is an arithmetic number, because the mean of its divisors is an integer number (2457000).

Almost surely, 2^49640778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 49640778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58968000).

49640778 is an abundant number, since it is smaller than the sum of its proper divisors (68295222).

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

49640778 is a wasteful number, since it uses less digits than its factorization.

49640778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307 (or 1304 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 49640778 is about 7045.6211933370. The cubic root of 49640778 is about 367.5187717747.

The spelling of 49640778 in words is "forty-nine million, six hundred forty thousand, seven hundred seventy-eight".