78148555972 has 24 divisors (see below), whose sum is σ = 138749451512. Its totient is φ = 38506752000.

The previous prime is 78148555963. The next prime is 78148555973. The reversal of 78148555972 is 27955584187.

It can be written as a sum of positive squares in 4 ways, for example, as 454798276 + 77693757696 = 21326^2 + 278736^2 .

It is a super-2 number, since 2×78148555972² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78148555972.

It is not an unprimeable number, because it can be changed into a prime (78148555973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239272 + ... + 462112.

Almost surely, 2^78148555972 is an apocalyptic number.

It is an amenable number.

78148555972 is a deficient number, since it is larger than the sum of its proper divisors (60600895540).

78148555972 is a wasteful number, since it uses less digits than its factorization.

78148555972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224119 (or 224117 counting only the distinct ones).

The product of its digits is 28224000, while the sum is 61.

The spelling of 78148555972 in words is "seventy-eight billion, one hundred forty-eight million, five hundred fifty-five thousand, nine hundred seventy-two".