78164797 has 2 divisors, whose sum is σ = 78164798. Its totient is φ = 78164796.

The previous prime is 78164777. The next prime is 78164837. The reversal of 78164797 is 79746187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53304601 + 24860196 = 7301^2 + 4986^2 .

It is a cyclic number.

It is not a de Polignac number, because 78164797 - 2¹⁵ = 78132029 is a prime.

It is a super-2 number, since 2×78164797² = 12219470980102418, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78164797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78164747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39082398 + 39082399.

It is an arithmetic number, because the mean of its divisors is an integer number (39082399).

Almost surely, 2^78164797 is an apocalyptic number.

It is an amenable number.

78164797 is a deficient number, since it is larger than the sum of its proper divisors (1).

78164797 is an equidigital number, since it uses as much as digits as its factorization.

78164797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 49.

The square root of 78164797 is about 8841.0857364919. The cubic root of 78164797 is about 427.5665630540.

It can be divided in two parts, 78164 and 797, that added together give a square (78961 = 281²).

The spelling of 78164797 in words is "seventy-eight million, one hundred sixty-four thousand, seven hundred ninety-seven".