77701998 has 64 divisors (see below), whose sum is σ = 178080768. Its totient is φ = 22389120.

The previous prime is 77701957. The next prime is 77701999. The reversal of 77701998 is 89910777.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77701999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114436 + ... + 115112.

It is an arithmetic number, because the mean of its divisors is an integer number (2782512).

Almost surely, 2^77701998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77701998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89040384).

77701998 is an abundant number, since it is smaller than the sum of its proper divisors (100378770).

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

77701998 is a wasteful number, since it uses less digits than its factorization.

77701998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777.

The product of its (nonzero) digits is 222264, while the sum is 48.

The square root of 77701998 is about 8814.8736803201. The cubic root of 77701998 is about 426.7210451796.

The spelling of 77701998 in words is "seventy-seven million, seven hundred one thousand, nine hundred ninety-eight".