870812640 has 96 divisors (see below), whose sum is σ = 3047859360. Its totient is φ = 232215552.

The previous prime is 870812639. The next prime is 870812647. The reversal of 870812640 is 46218078.

870812640 is a `hidden beast` number, since 8 + 7 + 0 + 8 + 1 + 2 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 870812595 and 870812604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870812647) 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, 96469 + ... + 105108.

It is an arithmetic number, because the mean of its divisors is an integer number (31748535).

Almost surely, 2^870812640 is an apocalyptic number.

870812640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

870812640 is an abundant number, since it is smaller than the sum of its proper divisors (2177046720).

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

870812640 is a wasteful number, since it uses less digits than its factorization.

870812640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201601 (or 201587 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 870812640 is about 29509.5347303206. The cubic root of 870812640 is about 954.9374117220.

The spelling of 870812640 in words is "eight hundred seventy million, eight hundred twelve thousand, six hundred forty".