78378775212 has 24 divisors (see below), whose sum is σ = 187826615536. Its totient is φ = 25420143168.

The previous prime is 78378775207. The next prime is 78378775231. The reversal of 78378775212 is 21257787387.

It is a happy number.

It is a super-2 number, since 2×78378775212² (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, 88263943 + ... + 88264830.

Almost surely, 2^78378775212 is an apocalyptic number.

It is an amenable number.

78378775212 is an abundant number, since it is smaller than the sum of its proper divisors (109447840324).

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

78378775212 is a wasteful number, since it uses less digits than its factorization.

78378775212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176528817 (or 176528815 counting only the distinct ones).

The product of its digits is 9219840, while the sum is 57.

The spelling of 78378775212 in words is "seventy-eight billion, three hundred seventy-eight million, seven hundred seventy-five thousand, two hundred twelve".