26978797 has 2 divisors, whose sum is σ = 26978798. Its totient is φ = 26978796.

The previous prime is 26978767. The next prime is 26978807. The reversal of 26978797 is 79787962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14791716 + 12187081 = 3846^2 + 3491^2 .

It is a cyclic number.

It is not a de Polignac number, because 26978797 - 2¹¹ = 26976749 is a prime.

It is a super-3 number, since 3×26978797³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26978767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13489398 + 13489399.

It is an arithmetic number, because the mean of its divisors is an integer number (13489399).

Almost surely, 2^26978797 is an apocalyptic number.

It is an amenable number.

26978797 is a deficient number, since it is larger than the sum of its proper divisors (1).

26978797 is an equidigital number, since it uses as much as digits as its factorization.

26978797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2667168, while the sum is 55.

The square root of 26978797 is about 5194.1117623709. Note that the first 3 decimals coincide. The cubic root of 26978797 is about 299.9214498051.

The spelling of 26978797 in words is "twenty-six million, nine hundred seventy-eight thousand, seven hundred ninety-seven".