872003661 has 8 divisors (see below), whose sum is σ = 1231064064. Its totient is φ = 547139520.

The previous prime is 872003633. The next prime is 872003677. The reversal of 872003661 is 166300278.

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

It is not a de Polignac number, because 872003661 - 2⁷ = 872003533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872003261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8549005 + ... + 8549106.

It is an arithmetic number, because the mean of its divisors is an integer number (153883008).

Almost surely, 2^872003661 is an apocalyptic number.

It is an amenable number.

872003661 is a deficient number, since it is larger than the sum of its proper divisors (359060403).

872003661 is a wasteful number, since it uses less digits than its factorization.

872003661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17098131.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 872003661 is about 29529.7081089536. The cubic root of 872003661 is about 955.3725732136.

The spelling of 872003661 in words is "eight hundred seventy-two million, three thousand, six hundred sixty-one".