49778640 has 120 divisors (see below), whose sum is σ = 170846208. Its totient is φ = 12983040.

The previous prime is 49778629. The next prime is 49778657. The reversal of 49778640 is 4687794.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 33105 + ... + 34575.

Almost surely, 2^49778640 is an apocalyptic number.

49778640 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 49778640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85423104).

49778640 is an abundant number, since it is smaller than the sum of its proper divisors (121067568).

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

49778640 is a wasteful number, since it uses less digits than its factorization.

49778640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537 (or 1528 counting only the distinct ones).

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

The square root of 49778640 is about 7055.3979334974. The cubic root of 49778640 is about 367.8586807722.

The spelling of 49778640 in words is "forty-nine million, seven hundred seventy-eight thousand, six hundred forty".