77361797 has 4 divisors (see below), whose sum is σ = 77439180. Its totient is φ = 77284416.

The previous prime is 77361743. The next prime is 77361839. The reversal of 77361797 is 79716377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79716377 = 13 ⋅6132029.

It can be written as a sum of positive squares in 2 ways, for example, as 6280036 + 71081761 = 2506^2 + 8431^2 .

It is a cyclic number.

It is not a de Polignac number, because 77361797 - 2⁶ = 77361733 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 (77361197) 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, 37172 + ... + 39197.

It is an arithmetic number, because the mean of its divisors is an integer number (19359795).

Almost surely, 2^77361797 is an apocalyptic number.

It is an amenable number.

77361797 is a deficient number, since it is larger than the sum of its proper divisors (77383).

77361797 is a wasteful number, since it uses less digits than its factorization.

77361797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77382.

The product of its digits is 388962, while the sum is 47.

The square root of 77361797 is about 8795.5555253776. Note that the first 4 decimals coincide. The cubic root of 77361797 is about 426.0973661961.

The spelling of 77361797 in words is "seventy-seven million, three hundred sixty-one thousand, seven hundred ninety-seven".