870628661 has 8 divisors (see below), whose sum is σ = 1011316224. Its totient is φ = 734019120.

The previous prime is 870628657. The next prime is 870628663. The reversal of 870628661 is 166826078.

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

It is a cyclic number.

It is not a de Polignac number, because 870628661 - 2² = 870628657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870628663) 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, 1019045 + ... + 1019898.

It is an arithmetic number, because the mean of its divisors is an integer number (126414528).

Almost surely, 2^870628661 is an apocalyptic number.

It is an amenable number.

870628661 is a deficient number, since it is larger than the sum of its proper divisors (140687563).

870628661 is a wasteful number, since it uses less digits than its factorization.

870628661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039011.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 870628661 is about 29506.4172850585. The cubic root of 870628661 is about 954.8701562274.

The spelling of 870628661 in words is "eight hundred seventy million, six hundred twenty-eight thousand, six hundred sixty-one".