77899890 has 16 divisors (see below), whose sum is σ = 186959808. Its totient is φ = 20773296.

The previous prime is 77899889. The next prime is 77899891. The reversal of 77899890 is 9899877.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77899889) and next prime (77899891).

It is a self number, because there is not a number n which added to its sum of digits gives 77899890.

It is not an unprimeable number, because it can be changed into a prime (77899891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1298302 + ... + 1298361.

It is an arithmetic number, because the mean of its divisors is an integer number (11684988).

Almost surely, 2^77899890 is an apocalyptic number.

77899890 is an abundant number, since it is smaller than the sum of its proper divisors (109059918).

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

77899890 is a wasteful number, since it uses less digits than its factorization.

77899890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596673.

The product of its (nonzero) digits is 2286144, while the sum is 57.

The square root of 77899890 is about 8826.0914339248. The cubic root of 77899890 is about 427.0829968085.

The spelling of 77899890 in words is "seventy-seven million, eight hundred ninety-nine thousand, eight hundred ninety".