78143740778 has 32 divisors (see below), whose sum is σ = 134173713600. Its totient is φ = 33896496384.

The previous prime is 78143740729. The next prime is 78143740793. The reversal of 78143740778 is 87704734187.

It is a super-2 number, since 2×78143740778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1610768 + ... + 1658571.

It is an arithmetic number, because the mean of its divisors is an integer number (4192928550).

Almost surely, 2^78143740778 is an apocalyptic number.

78143740778 is a deficient number, since it is larger than the sum of its proper divisors (56029972822).

78143740778 is a wasteful number, since it uses less digits than its factorization.

78143740778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269414.

The product of its (nonzero) digits is 7375872, while the sum is 56.

The spelling of 78143740778 in words is "seventy-eight billion, one hundred forty-three million, seven hundred forty thousand, seven hundred seventy-eight".