78374441 has 2 divisors, whose sum is σ = 78374442. Its totient is φ = 78374440.

The previous prime is 78374431. The next prime is 78374477. The reversal of 78374441 is 14447387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51552400 + 26822041 = 7180^2 + 5179^2 .

It is an emirp because it is prime and its reverse (14447387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78374441 - 2²² = 74180137 is a prime.

It is a super-2 number, since 2×78374441² = 12285106004124962, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78374395 and 78374404.

It is not a weakly prime, because it can be changed into another prime (78374431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39187220 + 39187221.

It is an arithmetic number, because the mean of its divisors is an integer number (39187221).

Almost surely, 2^78374441 is an apocalyptic number.

It is an amenable number.

78374441 is a deficient number, since it is larger than the sum of its proper divisors (1).

78374441 is an equidigital number, since it uses as much as digits as its factorization.

78374441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 38.

The square root of 78374441 is about 8852.9340334151. The cubic root of 78374441 is about 427.9484772899.

The spelling of 78374441 in words is "seventy-eight million, three hundred seventy-four thousand, four hundred forty-one".