79896781 has 2 divisors, whose sum is σ = 79896782. Its totient is φ = 79896780.

The previous prime is 79896743. The next prime is 79896799. The reversal of 79896781 is 18769897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66683556 + 13213225 = 8166^2 + 3635^2 .

It is a cyclic number.

It is not a de Polignac number, because 79896781 - 2¹¹ = 79894733 is a prime.

It is a super-2 number, since 2×79896781² = 12766991228323922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79896701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39948390 + 39948391.

It is an arithmetic number, because the mean of its divisors is an integer number (39948391).

Almost surely, 2^79896781 is an apocalyptic number.

It is an amenable number.

79896781 is a deficient number, since it is larger than the sum of its proper divisors (1).

79896781 is an equidigital number, since it uses as much as digits as its factorization.

79896781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 55.

The square root of 79896781 is about 8938.4999300778. The cubic root of 79896781 is about 430.7015427536.

It can be divided in two parts, 798 and 96781, that added together give a palindrome (97579).

The spelling of 79896781 in words is "seventy-nine million, eight hundred ninety-six thousand, seven hundred eighty-one".