87906221906 has 8 divisors (see below), whose sum is σ = 134925829104. Its totient is φ = 42930945540.

The previous prime is 87906221869. The next prime is 87906221939. The reversal of 87906221906 is 60912260978.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×87906221906³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511082600 + ... + 511082771.

It is an arithmetic number, because the mean of its divisors is an integer number (16865728638).

Almost surely, 2^87906221906 is an apocalyptic number.

87906221906 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

87906221906 is a deficient number, since it is larger than the sum of its proper divisors (47019607198).

87906221906 is a wasteful number, since it uses less digits than its factorization.

87906221906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022165416.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 87906221906 in words is "eighty-seven billion, nine hundred six million, two hundred twenty-one thousand, nine hundred six".