6990987858 has 16 divisors (see below), whose sum is σ = 13989447360. Its totient is φ = 2329084016.

The previous prime is 6990987823. The next prime is 6990987869. The reversal of 6990987858 is 8587890996.

It is a super-2 number, since 2×6990987858² = 97747822461406856328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6990987792 and 6990987801.

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 7 ways as a sum of consecutive naturals, for example, 299118 + ... + 321641.

It is an arithmetic number, because the mean of its divisors is an integer number (874340460).

Almost surely, 2^6990987858 is an apocalyptic number.

6990987858 is an abundant number, since it is smaller than the sum of its proper divisors (6998459502).

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

6990987858 is a wasteful number, since it uses less digits than its factorization.

6990987858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622641.

The product of its (nonzero) digits is 78382080, while the sum is 69.

The square root of 6990987858 is about 83612.1274576840. The cubic root of 6990987858 is about 1912.1098965285.

The spelling of 6990987858 in words is "six billion, nine hundred ninety million, nine hundred eighty-seven thousand, eight hundred fifty-eight".