50891440 has 40 divisors (see below), whose sum is σ = 119278080. Its totient is φ = 20192256.

The previous prime is 50891437. The next prime is 50891483. The reversal of 50891440 is 4419805.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7656 + ... + 12664.

It is an arithmetic number, because the mean of its divisors is an integer number (2981952).

Almost surely, 2^50891440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 50891440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59639040).

50891440 is an abundant number, since it is smaller than the sum of its proper divisors (68386640).

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

50891440 is a wasteful number, since it uses less digits than its factorization.

50891440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5149 (or 5143 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 50891440 is about 7133.8236591606. The cubic root of 50891440 is about 370.5796611575.

The spelling of 50891440 in words is "fifty million, eight hundred ninety-one thousand, four hundred forty".