78349797 has 12 divisors (see below), whose sum is σ = 113828364. Its totient is φ = 51930240.

The previous prime is 78349783. The next prime is 78349801. The reversal of 78349797 is 79794387.

It can be written as a sum of positive squares in 2 ways, for example, as 64016001 + 14333796 = 8001^2 + 3786^2 .

It is not a de Polignac number, because 78349797 - 2⁴ = 78349781 is a prime.

It is a super-2 number, since 2×78349797² = 12277381379882418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78349717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23604 + ... + 26717.

It is an arithmetic number, because the mean of its divisors is an integer number (9485697).

Almost surely, 2^78349797 is an apocalyptic number.

It is an amenable number.

78349797 is a deficient number, since it is larger than the sum of its proper divisors (35478567).

78349797 is a wasteful number, since it uses less digits than its factorization.

78349797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50500 (or 50497 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The square root of 78349797 is about 8851.5420690409. The cubic root of 78349797 is about 427.9036179892.

The spelling of 78349797 in words is "seventy-eight million, three hundred forty-nine thousand, seven hundred ninety-seven".