77898 has 8 divisors (see below), whose sum is σ = 155808. Its totient is φ = 25964.

The previous prime is 77893. The next prime is 77899. The reversal of 77898 is 89877.

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

77898 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77893) 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, 6486 + ... + 6497.

It is an arithmetic number, because the mean of its divisors is an integer number (19476).

2⁷⁷⁸⁹⁸ is an apocalyptic number.

77898 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77904).

77898 is a wasteful number, since it uses less digits than its factorization.

77898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12988.

The product of its digits is 28224, while the sum is 39.

The square root of 77898 is about 279.1021318442. The cubic root of 77898 is about 42.7079542831.

The spelling of 77898 in words is "seventy-seven thousand, eight hundred ninety-eight".