77998197 has 8 divisors (see below), whose sum is σ = 107583840. Its totient is φ = 50205680.

The previous prime is 77998189. The next prime is 77998213. The reversal of 77998197 is 79189977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77998197 - 2³ = 77998189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77998127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448179 + ... + 448352.

It is an arithmetic number, because the mean of its divisors is an integer number (13447980).

Almost surely, 2^77998197 is an apocalyptic number.

It is an amenable number.

77998197 is a deficient number, since it is larger than the sum of its proper divisors (29585643).

77998197 is a wasteful number, since it uses less digits than its factorization.

77998197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896563.

The product of its digits is 2000376, while the sum is 57.

The square root of 77998197 is about 8831.6587909633. The cubic root of 77998197 is about 427.2625760061.

The spelling of 77998197 in words is "seventy-seven million, nine hundred ninety-eight thousand, one hundred ninety-seven".