78831850640 has 40 divisors (see below), whose sum is σ = 183390871608. Its totient is φ = 31514362880.

The previous prime is 78831850631. The next prime is 78831850667. The reversal of 78831850640 is 4605813887.

It can be written as a sum of positive squares in 4 ways, for example, as 10614768784 + 68217081856 = 103028^2 + 261184^2 .

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

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, 148607 + ... + 423966.

Almost surely, 2^78831850640 is an apocalyptic number.

It is an amenable number.

78831850640 is an abundant number, since it is smaller than the sum of its proper divisors (104559020968).

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

78831850640 is a wasteful number, since it uses less digits than its factorization.

78831850640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574307 (or 574301 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 78831850640 in words is "seventy-eight billion, eight hundred thirty-one million, eight hundred fifty thousand, six hundred forty".