78135188 has 6 divisors (see below), whose sum is σ = 136736586. Its totient is φ = 39067592.

The previous prime is 78135181. The next prime is 78135203. The reversal of 78135188 is 88153187.

It can be written as a sum of positive squares in only one way, i.e., 46076944 + 32058244 = 6788^2 + 5662^2 .

It is a super-2 number, since 2×78135188² = 12210215207590688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78135181) 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, 9766895 + ... + 9766902.

It is an arithmetic number, because the mean of its divisors is an integer number (22789431).

Almost surely, 2^78135188 is an apocalyptic number.

It is an amenable number.

78135188 is a deficient number, since it is larger than the sum of its proper divisors (58601398).

78135188 is a wasteful number, since it uses less digits than its factorization.

78135188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19533801 (or 19533799 counting only the distinct ones).

The product of its digits is 53760, while the sum is 41.

The square root of 78135188 is about 8839.4110663550. The cubic root of 78135188 is about 427.5125685121.

The spelling of 78135188 in words is "seventy-eight million, one hundred thirty-five thousand, one hundred eighty-eight".