861604648 has 8 divisors (see below), whose sum is σ = 1615508730. Its totient is φ = 430802320.

The previous prime is 861604621. The next prime is 861604649. The reversal of 861604648 is 846406168.

It can be written as a sum of positive squares in only one way, i.e., 747584964 + 114019684 = 27342^2 + 10678^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (861604649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53850283 + ... + 53850298.

Almost surely, 2^861604648 is an apocalyptic number.

It is an amenable number.

861604648 is a deficient number, since it is larger than the sum of its proper divisors (753904082).

861604648 is a wasteful number, since it uses less digits than its factorization.

861604648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107700587 (or 107700583 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 861604648 is about 29353.1028683511. The cubic root of 861604648 is about 951.5596349738.

The spelling of 861604648 in words is "eight hundred sixty-one million, six hundred four thousand, six hundred forty-eight".