78354811 has 2 divisors, whose sum is σ = 78354812. Its totient is φ = 78354810.

The previous prime is 78354797. The next prime is 78354817. The reversal of 78354811 is 11845387.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78354811 is a prime.

It is a super-2 number, since 2×78354811² = 12278952813691442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78354817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39177405 + 39177406.

It is an arithmetic number, because the mean of its divisors is an integer number (39177406).

Almost surely, 2^78354811 is an apocalyptic number.

78354811 is a deficient number, since it is larger than the sum of its proper divisors (1).

78354811 is an equidigital number, since it uses as much as digits as its factorization.

78354811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 37.

The square root of 78354811 is about 8851.8252919949. The cubic root of 78354811 is about 427.9127457004.

The spelling of 78354811 in words is "seventy-eight million, three hundred fifty-four thousand, eight hundred eleven".