49278840 has 128 divisors (see below), whose sum is σ = 164505600. Its totient is φ = 11727360.

The previous prime is 49278833. The next prime is 49278847. The reversal of 49278840 is 4887294.

It is an interprime number because it is at equal distance from previous prime (49278833) and next prime (49278847).

It is a junction number, because it is equal to n+sod(n) for n = 49278792 and 49278801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49278847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47851 + ... + 48869.

It is an arithmetic number, because the mean of its divisors is an integer number (1285200).

Almost surely, 2^49278840 is an apocalyptic number.

49278840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 49278840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82252800).

49278840 is an abundant number, since it is smaller than the sum of its proper divisors (115226760).

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

49278840 is a wasteful number, since it uses less digits than its factorization.

49278840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 49278840 is about 7019.8888880096. Note that the first 6 decimals coincide. The cubic root of 49278840 is about 366.6233814836.

The spelling of 49278840 in words is "forty-nine million, two hundred seventy-eight thousand, eight hundred forty".