78011812 has 6 divisors (see below), whose sum is σ = 136520678. Its totient is φ = 39005904.

The previous prime is 78011767. The next prime is 78011819. The reversal of 78011812 is 21811087.

It can be written as a sum of positive squares in only one way, i.e., 58155876 + 19855936 = 7626^2 + 4456^2 .

It is not an unprimeable number, because it can be changed into a prime (78011819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9751473 + ... + 9751480.

Almost surely, 2^78011812 is an apocalyptic number.

It is an amenable number.

78011812 is a deficient number, since it is larger than the sum of its proper divisors (58508866).

78011812 is a wasteful number, since it uses less digits than its factorization.

78011812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19502957 (or 19502955 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 78011812 is about 8832.4295638290. The cubic root of 78011812 is about 427.2874348779.

Adding to 78011812 its reverse (21811087), we get a palindrome (99822899).

The spelling of 78011812 in words is "seventy-eight million, eleven thousand, eight hundred twelve".