77869998 has 40 divisors (see below), whose sum is σ = 175320288. Its totient is φ = 25832736.

The previous prime is 77869991. The next prime is 77870027. The reversal of 77869998 is 89996877.

It is a super-5 number, since 5×77869998⁵ (a number of 41 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77869991) 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 19 ways as a sum of consecutive naturals, for example, 36715 + ... + 38777.

Almost surely, 2^77869998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77869998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87660144).

77869998 is an abundant number, since it is smaller than the sum of its proper divisors (97450290).

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

77869998 is a wasteful number, since it uses less digits than its factorization.

77869998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310 (or 2301 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 77869998 is about 8824.3978831419. The cubic root of 77869998 is about 427.0283625927.

The spelling of 77869998 in words is "seventy-seven million, eight hundred sixty-nine thousand, nine hundred ninety-eight".