78420464816 has 20 divisors (see below), whose sum is σ = 155172410592. Its totient is φ = 38375971776.

The previous prime is 78420464807. The next prime is 78420464831. The reversal of 78420464816 is 61846402487.

It is a happy number.

It is a super-2 number, since 2×78420464816² (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 3 ways as a sum of consecutive naturals, for example, 52140515 + ... + 52142018.

Almost surely, 2^78420464816 is an apocalyptic number.

It is an amenable number.

78420464816 is a deficient number, since it is larger than the sum of its proper divisors (76751945776).

78420464816 is a wasteful number, since it uses less digits than its factorization.

78420464816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104282588 (or 104282582 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 50.

The spelling of 78420464816 in words is "seventy-eight billion, four hundred twenty million, four hundred sixty-four thousand, eight hundred sixteen".