78937521940 has 12 divisors (see below), whose sum is σ = 165768796116. Its totient is φ = 31575008768.

The previous prime is 78937521917. The next prime is 78937521973. The reversal of 78937521940 is 4912573987.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9746428176 + 69191093764 = 98724^2 + 263042^2 .

It is a super-2 number, since 2×78937521940² (a number of 23 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1973438029 + ... + 1973438068.

It is an arithmetic number, because the mean of its divisors is an integer number (13814066343).

Almost surely, 2^78937521940 is an apocalyptic number.

It is an amenable number.

78937521940 is an abundant number, since it is smaller than the sum of its proper divisors (86831274176).

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

78937521940 is a wasteful number, since it uses less digits than its factorization.

78937521940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946876106 (or 3946876104 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 78937521940 in words is "seventy-eight billion, nine hundred thirty-seven million, five hundred twenty-one thousand, nine hundred forty".