78493141 has 4 divisors (see below), whose sum is σ = 78510892. Its totient is φ = 78475392.

The previous prime is 78493117. The next prime is 78493171. The reversal of 78493141 is 14139487.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18740241 + 59752900 = 4329^2 + 7730^2 .

It is a 4-Lehmer number, since φ(78493141) divides (78493141-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 78493141 - 2⁵ = 78493109 is a prime.

It is a super-2 number, since 2×78493141² = 12322346368091762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78493141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78493171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3655 + ... + 13051.

It is an arithmetic number, because the mean of its divisors is an integer number (19627723).

Almost surely, 2^78493141 is an apocalyptic number.

It is an amenable number.

78493141 is a deficient number, since it is larger than the sum of its proper divisors (17751).

78493141 is an equidigital number, since it uses as much as digits as its factorization.

78493141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17750.

The product of its digits is 24192, while the sum is 37.

The square root of 78493141 is about 8859.6354891158. The cubic root of 78493141 is about 428.1644144436.

The spelling of 78493141 in words is "seventy-eight million, four hundred ninety-three thousand, one hundred forty-one".