78404441 has 2 divisors, whose sum is σ = 78404442. Its totient is φ = 78404440.

The previous prime is 78404411. The next prime is 78404449. The reversal of 78404441 is 14440487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41011216 + 37393225 = 6404^2 + 6115^2 .

It is a cyclic number.

It is not a de Polignac number, because 78404441 - 2²² = 74210137 is a prime.

It is a super-2 number, since 2×78404441² = 12294512737044962, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78404398 and 78404407.

It is not a weakly prime, because it can be changed into another prime (78404449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39202220 + 39202221.

It is an arithmetic number, because the mean of its divisors is an integer number (39202221).

Almost surely, 2^78404441 is an apocalyptic number.

It is an amenable number.

78404441 is a deficient number, since it is larger than the sum of its proper divisors (1).

78404441 is an equidigital number, since it uses as much as digits as its factorization.

78404441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14336, while the sum is 32.

The square root of 78404441 is about 8854.6282248325. The cubic root of 78404441 is about 428.0030733905.

The spelling of 78404441 in words is "seventy-eight million, four hundred four thousand, four hundred forty-one".