920872865 has 16 divisors (see below), whose sum is σ = 1208946816. Its totient is φ = 667814400.

The previous prime is 920872861. The next prime is 920872871. The reversal of 920872865 is 568278029.

It is not a de Polignac number, because 920872865 - 2² = 920872861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (920872861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4301 + ... + 43130.

It is an arithmetic number, because the mean of its divisors is an integer number (75559176).

Almost surely, 2^920872865 is an apocalyptic number.

It is an amenable number.

920872865 is a deficient number, since it is larger than the sum of its proper divisors (288073951).

920872865 is a wasteful number, since it uses less digits than its factorization.

920872865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47800.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 920872865 is about 30345.8871183559. The cubic root of 920872865 is about 972.8963154963.

The spelling of 920872865 in words is "nine hundred twenty million, eight hundred seventy-two thousand, eight hundred sixty-five".