78244069 has 2 divisors, whose sum is σ = 78244070. Its totient is φ = 78244068.

The previous prime is 78244043. The next prime is 78244079. The reversal of 78244069 is 96044287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74615044 + 3629025 = 8638^2 + 1905^2 .

It is an emirp because it is prime and its reverse (96044287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78244069 - 2¹⁹ = 77719781 is a prime.

It is a super-2 number, since 2×78244069² = 12244268667353522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78244079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39122034 + 39122035.

It is an arithmetic number, because the mean of its divisors is an integer number (39122035).

Almost surely, 2^78244069 is an apocalyptic number.

It is an amenable number.

78244069 is a deficient number, since it is larger than the sum of its proper divisors (1).

78244069 is an equidigital number, since it uses as much as digits as its factorization.

78244069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 78244069 is about 8845.5677601836. The cubic root of 78244069 is about 427.7110552307.

The spelling of 78244069 in words is "seventy-eight million, two hundred forty-four thousand, sixty-nine".