899720785 has 16 divisors (see below), whose sum is σ = 1134850176. Its totient is φ = 683444608.

The previous prime is 899720779. The next prime is 899720791. The reversal of 899720785 is 587027998.

It is an interprime number because it is at equal distance from previous prime (899720779) and next prime (899720791).

It is a cyclic number.

It is not a de Polignac number, because 899720785 - 2⁵ = 899720753 is a prime.

It is a super-2 number, since 2×899720785² = 1618994981922032450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12799 + ... + 44308.

It is an arithmetic number, because the mean of its divisors is an integer number (70928136).

Almost surely, 2^899720785 is an apocalyptic number.

It is an amenable number.

899720785 is a deficient number, since it is larger than the sum of its proper divisors (235129391).

899720785 is a wasteful number, since it uses less digits than its factorization.

899720785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57272.

The product of its (nonzero) digits is 2540160, while the sum is 55.

The square root of 899720785 is about 29995.3460556800. The cubic root of 899720785 is about 965.3895301607.

The spelling of 899720785 in words is "eight hundred ninety-nine million, seven hundred twenty thousand, seven hundred eighty-five".