897721806 has 16 divisors (see below), whose sum is σ = 1796734800. Its totient is φ = 299025408.

The previous prime is 897721789. The next prime is 897721813. The reversal of 897721806 is 608127798.

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, 44641 + ... + 61548.

It is an arithmetic number, because the mean of its divisors is an integer number (112295925).

Almost surely, 2^897721806 is an apocalyptic number.

897721806 is an abundant number, since it is smaller than the sum of its proper divisors (899012994).

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

897721806 is a wasteful number, since it uses less digits than its factorization.

897721806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107603.

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 897721806 is about 29962.0060409846. The cubic root of 897721806 is about 964.6740399083.

The spelling of 897721806 in words is "eight hundred ninety-seven million, seven hundred twenty-one thousand, eight hundred six".