872144636 has 24 divisors (see below), whose sum is σ = 1737396864. Its totient is φ = 379192880.

The previous prime is 872144629. The next prime is 872144639. The reversal of 872144636 is 636441278.

It is a super-2 number, since 2×872144636² = 1521272532207144992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 872144593 and 872144602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872144639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429890 + ... + 431913.

It is an arithmetic number, because the mean of its divisors is an integer number (72391536).

Almost surely, 2^872144636 is an apocalyptic number.

It is an amenable number.

872144636 is a deficient number, since it is larger than the sum of its proper divisors (865252228).

872144636 is a wasteful number, since it uses less digits than its factorization.

872144636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861841 (or 861839 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The square root of 872144636 is about 29532.0950154235. The cubic root of 872144636 is about 955.4240547983.

The spelling of 872144636 in words is "eight hundred seventy-two million, one hundred forty-four thousand, six hundred thirty-six".