2154633858 has 224 divisors, whose sum is σ = 5699688960. Its totient is φ = 604661760.

The previous prime is 2154633829. The next prime is 2154633881. The reversal of 2154633858 is 8583364512.

2154633858 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 633 + 8 + 5 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 11163810 + ... + 11164002.

It is an arithmetic number, because the mean of its divisors is an integer number (25445040).

Almost surely, 2^2154633858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2154633858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2849844480).

2154633858 is an abundant number, since it is smaller than the sum of its proper divisors (3545055102).

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

2154633858 is a wasteful number, since it uses less digits than its factorization.

2154633858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 261 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 2154633858 is about 46418.0337584435. The cubic root of 2154633858 is about 1291.5894631419.

The spelling of 2154633858 in words is "two billion, one hundred fifty-four million, six hundred thirty-three thousand, eight hundred fifty-eight".