77899998 has 16 divisors (see below), whose sum is σ = 169963776. Its totient is φ = 23606040.

The previous prime is 77899963. The next prime is 77899999. The reversal of 77899998 is 89999877.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 1180303 = 77899998 / (7 + 7 + 8 + 9 + 9 + 9 + 9 + 8).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77899999) 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 7 ways as a sum of consecutive naturals, for example, 590086 + ... + 590217.

It is an arithmetic number, because the mean of its divisors is an integer number (10622736).

Almost surely, 2^77899998 is an apocalyptic number.

77899998 is an abundant number, since it is smaller than the sum of its proper divisors (92063778).

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

77899998 is a wasteful number, since it uses less digits than its factorization.

77899998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180319.

The product of its digits is 20575296, while the sum is 66.

The square root of 77899998 is about 8826.0975521461. The cubic root of 77899998 is about 427.0831941770.

The spelling of 77899998 in words is "seventy-seven million, eight hundred ninety-nine thousand, nine hundred ninety-eight".