823638870 has 48 divisors (see below), whose sum is σ = 2199347280. Its totient is φ = 213700032.

The previous prime is 823638863. The next prime is 823638913. The reversal of 823638870 is 78836328.

823638870 is a `hidden beast` number, since 8 + 2 + 3 + 638 + 8 + 7 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 120340 + ... + 126999.

It is an arithmetic number, because the mean of its divisors is an integer number (45819735).

Almost surely, 2^823638870 is an apocalyptic number.

823638870 is an abundant number, since it is smaller than the sum of its proper divisors (1375708410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

823638870 is a wasteful number, since it uses less digits than its factorization.

823638870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247389 (or 247386 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 823638870 is about 28699.1092196256. The cubic root of 823638870 is about 937.3726504350.

The spelling of 823638870 in words is "eight hundred twenty-three million, six hundred thirty-eight thousand, eight hundred seventy".