870817520 has 40 divisors (see below), whose sum is σ = 2143751184. Its totient is φ = 327836672.

The previous prime is 870817501. The next prime is 870817523. The reversal of 870817520 is 25718078.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870817523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318794 + ... + 321513.

Almost surely, 2^870817520 is an apocalyptic number.

870817520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

870817520 is an abundant number, since it is smaller than the sum of its proper divisors (1272933664).

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

870817520 is a wasteful number, since it uses less digits than its factorization.

870817520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640337 (or 640331 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 870817520 is about 29509.6174153444. The cubic root of 870817520 is about 954.9391955293.

The spelling of 870817520 in words is "eight hundred seventy million, eight hundred seventeen thousand, five hundred twenty".