78163437728 has 48 divisors (see below), whose sum is σ = 164914807680. Its totient is φ = 36372162816.

The previous prime is 78163437701. The next prime is 78163437739. The reversal of 78163437728 is 82773436187.

It is a super-2 number, since 2×78163437728² (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 7 ways as a sum of consecutive naturals, for example, 1407908 + ... + 1462371.

It is an arithmetic number, because the mean of its divisors is an integer number (3435725160).

Almost surely, 2^78163437728 is an apocalyptic number.

It is an amenable number.

78163437728 is an abundant number, since it is smaller than the sum of its proper divisors (86751369952).

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

78163437728 is a wasteful number, since it uses less digits than its factorization.

78163437728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2870349 (or 2870341 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 56.

The spelling of 78163437728 in words is "seventy-eight billion, one hundred sixty-three million, four hundred thirty-seven thousand, seven hundred twenty-eight".