78121118 has 4 divisors (see below), whose sum is σ = 117181680. Its totient is φ = 39060558.

The previous prime is 78121111. The next prime is 78121123. The reversal of 78121118 is 81112187.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×78121118³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78121111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19530278 + ... + 19530281.

It is an arithmetic number, because the mean of its divisors is an integer number (29295420).

Almost surely, 2^78121118 is an apocalyptic number.

78121118 is a deficient number, since it is larger than the sum of its proper divisors (39060562).

78121118 is a wasteful number, since it uses less digits than its factorization.

78121118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39060561.

The product of its digits is 896, while the sum is 29.

The square root of 78121118 is about 8838.6151630219. The cubic root of 78121118 is about 427.4869058835.

The spelling of 78121118 in words is "seventy-eight million, one hundred twenty-one thousand, one hundred eighteen".