38889591858 has 80 divisors (see below), whose sum is σ = 94530383640. Its totient is φ = 11878596864.

The previous prime is 38889591857. The next prime is 38889591907. The reversal of 38889591858 is 85819598883.

38889591858 is a `hidden beast` number, since 388 + 89 + 5 + 91 + 85 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 37662000489 + 1227591369 = 194067^2 + 35037^2 .

It is not an unprimeable number, because it can be changed into a prime (38889591857) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 221128 + ... + 355916.

Almost surely, 2^38889591858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38889591858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47265191820).

38889591858 is an abundant number, since it is smaller than the sum of its proper divisors (55640791782).

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

38889591858 is a wasteful number, since it uses less digits than its factorization.

38889591858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134953 (or 134944 counting only the distinct ones).

The product of its digits is 199065600, while the sum is 72.

The spelling of 38889591858 in words is "thirty-eight billion, eight hundred eighty-nine million, five hundred ninety-one thousand, eight hundred fifty-eight".