78734069 has 2 divisors, whose sum is σ = 78734070. Its totient is φ = 78734068.

The previous prime is 78734059. The next prime is 78734099. The reversal of 78734069 is 96043787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58140625 + 20593444 = 7625^2 + 4538^2 .

It is a cyclic number.

It is not a de Polignac number, because 78734069 - 2²⁰ = 77685493 is a prime.

It is a super-2 number, since 2×78734069² = 12398107242593522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78734059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39367034 + 39367035.

It is an arithmetic number, because the mean of its divisors is an integer number (39367035).

Almost surely, 2^78734069 is an apocalyptic number.

It is an amenable number.

78734069 is a deficient number, since it is larger than the sum of its proper divisors (1).

78734069 is an equidigital number, since it uses as much as digits as its factorization.

78734069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 78734069 is about 8873.2220190864. Note that the first 3 decimals coincide. The cubic root of 78734069 is about 428.6020383798.

The spelling of 78734069 in words is "seventy-eight million, seven hundred thirty-four thousand, sixty-nine".