4478811891 has 24 divisors (see below), whose sum is σ = 6362931120. Its totient is φ = 2801713152.

The previous prime is 4478811871. The next prime is 4478811901. The reversal of 4478811891 is 1981188744.

It is not a de Polignac number, because 4478811891 - 2⁷ = 4478811763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (4478811811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284515 + ... + 299843.

It is an arithmetic number, because the mean of its divisors is an integer number (265122130).

Almost surely, 2^4478811891 is an apocalyptic number.

4478811891 is a deficient number, since it is larger than the sum of its proper divisors (1884119229).

4478811891 is a wasteful number, since it uses less digits than its factorization.

4478811891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15703 (or 15686 counting only the distinct ones).

The product of its digits is 516096, while the sum is 51.

The square root of 4478811891 is about 66923.9261475296. The cubic root of 4478811891 is about 1648.3683767961.

The spelling of 4478811891 in words is "four billion, four hundred seventy-eight million, eight hundred eleven thousand, eight hundred ninety-one".