78474691 has 2 divisors, whose sum is σ = 78474692. Its totient is φ = 78474690.

The previous prime is 78474679. The next prime is 78474701. The reversal of 78474691 is 19647487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78474691 - 2¹¹ = 78472643 is a prime.

It is not a weakly prime, because it can be changed into another prime (78474611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39237345 + 39237346.

It is an arithmetic number, because the mean of its divisors is an integer number (39237346).

Almost surely, 2^78474691 is an apocalyptic number.

78474691 is a deficient number, since it is larger than the sum of its proper divisors (1).

78474691 is an equidigital number, since it uses as much as digits as its factorization.

78474691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 78474691 is about 8858.5941886961. The cubic root of 78474691 is about 428.1308647926.

The spelling of 78474691 in words is "seventy-eight million, four hundred seventy-four thousand, six hundred ninety-one".