8721006 has 16 divisors (see below), whose sum is σ = 19933824. Its totient is φ = 2491704.

The previous prime is 8720977. The next prime is 8721029. The reversal of 8721006 is 6001278.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103780 + ... + 103863.

It is an arithmetic number, because the mean of its divisors is an integer number (1245864).

Almost surely, 2^8721006 is an apocalyptic number.

8721006 is an abundant number, since it is smaller than the sum of its proper divisors (11212818).

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

8721006 is a wasteful number, since it uses less digits than its factorization.

8721006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207655.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 8721006 is about 2953.1349444277. The cubic root of 8721006 is about 205.8364082800.

The spelling of 8721006 in words is "eight million, seven hundred twenty-one thousand, six".