49991550 has 96 divisors (see below), whose sum is σ = 144847872. Its totient is φ = 11172480.

The previous prime is 49991549. The next prime is 49991609. The reversal of 49991550 is 5519994.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 48844 + ... + 49856.

It is an arithmetic number, because the mean of its divisors is an integer number (1508832).

Almost surely, 2^49991550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 49991550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72423936).

49991550 is an abundant number, since it is smaller than the sum of its proper divisors (94856322).

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

49991550 is a wasteful number, since it uses less digits than its factorization.

49991550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 49991550 is about 7070.4702813886. The cubic root of 49991550 is about 368.3823953174.

The spelling of 49991550 in words is "forty-nine million, nine hundred ninety-one thousand, five hundred fifty".