77794397 has 4 divisors (see below), whose sum is σ = 82370556. Its totient is φ = 73218240.

The previous prime is 77794393. The next prime is 77794399. The reversal of 77794397 is 79349777.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79349777 = 13 ⋅6103829.

It can be written as a sum of positive squares in 2 ways, for example, as 68128516 + 9665881 = 8254^2 + 3109^2 .

It is a cyclic number.

It is not a de Polignac number, because 77794397 - 2² = 77794393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77794393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2288054 + ... + 2288087.

It is an arithmetic number, because the mean of its divisors is an integer number (20592639).

Almost surely, 2^77794397 is an apocalyptic number.

It is an amenable number.

77794397 is a deficient number, since it is larger than the sum of its proper divisors (4576159).

77794397 is a wasteful number, since it uses less digits than its factorization.

77794397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4576158.

The product of its digits is 2333772, while the sum is 53.

The square root of 77794397 is about 8820.1132078902. The cubic root of 77794397 is about 426.8901226826.

The spelling of 77794397 in words is "seventy-seven million, seven hundred ninety-four thousand, three hundred ninety-seven".