78740138 has 16 divisors (see below), whose sum is σ = 122115840. Its totient is φ = 38054016.

The previous prime is 78740111. The next prime is 78740147. The reversal of 78740138 is 83104787.

It is a Curzon number.

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, 3623 + ... + 13061.

It is an arithmetic number, because the mean of its divisors is an integer number (7632240).

Almost surely, 2^78740138 is an apocalyptic number.

78740138 is a deficient number, since it is larger than the sum of its proper divisors (43375702).

78740138 is a wasteful number, since it uses less digits than its factorization.

78740138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9581.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 78740138 is about 8873.5639965011. The cubic root of 78740138 is about 428.6130506349.

The spelling of 78740138 in words is "seventy-eight million, seven hundred forty thousand, one hundred thirty-eight".