78135803 has 2 divisors, whose sum is σ = 78135804. Its totient is φ = 78135802.

The previous prime is 78135781. The next prime is 78135821. The reversal of 78135803 is 30853187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78135803 - 2¹² = 78131707 is a prime.

It is a super-2 number, since 2×78135803² = 12210407420909618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78135203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39067901 + 39067902.

It is an arithmetic number, because the mean of its divisors is an integer number (39067902).

Almost surely, 2^78135803 is an apocalyptic number.

78135803 is a deficient number, since it is larger than the sum of its proper divisors (1).

78135803 is an equidigital number, since it uses as much as digits as its factorization.

78135803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 78135803 is about 8839.4458536721. The cubic root of 78135803 is about 427.5136901558.

The spelling of 78135803 in words is "seventy-eight million, one hundred thirty-five thousand, eight hundred three".