861720634 has 8 divisors (see below), whose sum is σ = 1311873408. Its totient is φ = 424429500.

The previous prime is 861720619. The next prime is 861720647. The reversal of 861720634 is 436027168.

861720634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×861720634² = 1485124902122723912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 861720593 and 861720602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3215242 + ... + 3215509.

It is an arithmetic number, because the mean of its divisors is an integer number (163984176).

Almost surely, 2^861720634 is an apocalyptic number.

861720634 is a deficient number, since it is larger than the sum of its proper divisors (450152774).

861720634 is a wasteful number, since it uses less digits than its factorization.

861720634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6430820.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 861720634 is about 29355.0785044087. The cubic root of 861720634 is about 951.6023315262.

The spelling of 861720634 in words is "eight hundred sixty-one million, seven hundred twenty thousand, six hundred thirty-four".