78814081 has 2 divisors, whose sum is σ = 78814082. Its totient is φ = 78814080.

The previous prime is 78814067. The next prime is 78814103. The reversal of 78814081 is 18041887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76737600 + 2076481 = 8760^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 78814081 - 2⁹ = 78813569 is a prime.

It is a super-2 number, since 2×78814081² = 12423318727749122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78814081.

It is not a weakly prime, because it can be changed into another prime (78814051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39407040 + 39407041.

It is an arithmetic number, because the mean of its divisors is an integer number (39407041).

Almost surely, 2^78814081 is an apocalyptic number.

It is an amenable number.

78814081 is a deficient number, since it is larger than the sum of its proper divisors (1).

78814081 is an equidigital number, since it uses as much as digits as its factorization.

78814081 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 37.

The square root of 78814081 is about 8877.7294957664. The cubic root of 78814081 is about 428.7471754497.

The spelling of 78814081 in words is "seventy-eight million, eight hundred fourteen thousand, eighty-one".