78812571916040 has 32 divisors (see below), whose sum is σ = 187759362507480. Its totient is φ = 29670615309312.

The previous prime is 78812571916037. The next prime is 78812571916061. The reversal of 78812571916040 is 4061917521887.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 63153124247236 + 15659447668804 = 7946894^2 + 3957202^2 .

It is a super-2 number, since 2×78812571916040² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57950419847 + ... + 57950421206.

Almost surely, 2^{78812571916040} is an apocalyptic number.

It is an amenable number.

78812571916040 is an abundant number, since it is smaller than the sum of its proper divisors (108946790591440).

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

78812571916040 is a wasteful number, since it uses less digits than its factorization.

78812571916040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115900841081 (or 115900841077 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 59.

The spelling of 78812571916040 in words is "seventy-eight trillion, eight hundred twelve billion, five hundred seventy-one million, nine hundred sixteen thousand, forty".