1662408858 has 64 divisors (see below), whose sum is σ = 3795600384. Its totient is φ = 480480000.

The previous prime is 1662408851. The next prime is 1662408871. The reversal of 1662408858 is 8588042661.

It is a happy number.

It is a super-2 number, since 2×1662408858² = 5527206422313728328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1662408851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 607353 + ... + 610083.

It is an arithmetic number, because the mean of its divisors is an integer number (59306256).

Almost surely, 2^1662408858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1662408858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1897800192).

1662408858 is an abundant number, since it is smaller than the sum of its proper divisors (2133191526).

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

1662408858 is a wasteful number, since it uses less digits than its factorization.

1662408858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171.

The product of its (nonzero) digits is 737280, while the sum is 48.

The square root of 1662408858 is about 40772.6484055181. The cubic root of 1662408858 is about 1184.6206024293.

The spelling of 1662408858 in words is "one billion, six hundred sixty-two million, four hundred eight thousand, eight hundred fifty-eight".