2158688490 has 32 divisors (see below), whose sum is σ = 5920974720. Its totient is φ = 493414464.

The previous prime is 2158688489. The next prime is 2158688527. The reversal of 2158688490 is 948868512.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5139525 + ... + 5139944.

It is an arithmetic number, because the mean of its divisors is an integer number (185030460).

Almost surely, 2^2158688490 is an apocalyptic number.

2158688490 is an abundant number, since it is smaller than the sum of its proper divisors (3762286230).

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

2158688490 is a wasteful number, since it uses less digits than its factorization.

2158688490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10279486.

The product of its (nonzero) digits is 1105920, while the sum is 51.

The square root of 2158688490 is about 46461.6884109908. The cubic root of 2158688490 is about 1292.3991348794.

The spelling of 2158688490 in words is "two billion, one hundred fifty-eight million, six hundred eighty-eight thousand, four hundred ninety".