78485121 has 36 divisors (see below), whose sum is σ = 133947216. Its totient is φ = 43898400.

The previous prime is 78485117. The next prime is 78485129. The reversal of 78485121 is 12158487.

It is not a de Polignac number, because 78485121 - 2² = 78485117 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78485129) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14386 + ... + 19076.

It is an arithmetic number, because the mean of its divisors is an integer number (3720756).

Almost surely, 2^78485121 is an apocalyptic number.

It is an amenable number.

78485121 is a deficient number, since it is larger than the sum of its proper divisors (55462095).

78485121 is a wasteful number, since it uses less digits than its factorization.

78485121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4734 (or 4718 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 78485121 is about 8859.1828629959. The cubic root of 78485121 is about 428.1498314473.

It can be divided in two parts, 78485 and 121, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 78485121 in words is "seventy-eight million, four hundred eighty-five thousand, one hundred twenty-one".