78105143448040 has 32 divisors (see below), whose sum is σ = 180486209863080. Its totient is φ = 30397677449472.

The previous prime is 78105143448011. The next prime is 78105143448041. The reversal of 78105143448040 is 4084434150187.

It can be written as a sum of positive squares in 4 ways, for example, as 77983982369316 + 121161078724 = 8830854^2 + 348082^2 .

It is a super-2 number, since 2×78105143448040² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78105143448041) 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, 26386871307 + ... + 26386874266.

Almost surely, 2^{78105143448040} is an apocalyptic number.

It is an amenable number.

78105143448040 is an abundant number, since it is smaller than the sum of its proper divisors (102381066415040).

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

78105143448040 is a wasteful number, since it uses less digits than its factorization.

78105143448040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52773745621 (or 52773745617 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 49.

The spelling of 78105143448040 in words is "seventy-eight trillion, one hundred five billion, one hundred forty-three million, four hundred forty-eight thousand, forty".