878021772340 has 24 divisors (see below), whose sum is σ = 1860162945480. Its totient is φ = 348100666368.

The previous prime is 878021772317. The next prime is 878021772361. The reversal of 878021772340 is 43277120878.

It can be written as a sum of positive squares in 4 ways, for example, as 104557809316 + 773463963024 = 323354^2 + 879468^2 .

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 7 ways as a sum of consecutive naturals, for example, 194250345 + ... + 194254864.

It is an arithmetic number, because the mean of its divisors is an integer number (77506789395).

Almost surely, 2^878021772340 is an apocalyptic number.

It is an amenable number.

878021772340 is an abundant number, since it is smaller than the sum of its proper divisors (982141173140).

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

878021772340 is a wasteful number, since it uses less digits than its factorization.

878021772340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388505331 (or 388505329 counting only the distinct ones).

The product of its (nonzero) digits is 1053696, while the sum is 49.

The spelling of 878021772340 in words is "eight hundred seventy-eight billion, twenty-one million, seven hundred seventy-two thousand, three hundred forty".