77219898 has 16 divisors (see below), whose sum is σ = 176502720. Its totient is φ = 22062816.

The previous prime is 77219897. The next prime is 77219903. The reversal of 77219898 is 89891277.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77219898.

It is not an unprimeable number, because it can be changed into a prime (77219897) 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, 919243 + ... + 919326.

It is an arithmetic number, because the mean of its divisors is an integer number (11031420).

Almost surely, 2^77219898 is an apocalyptic number.

77219898 is an abundant number, since it is smaller than the sum of its proper divisors (99282822).

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

77219898 is a wasteful number, since it uses less digits than its factorization.

77219898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838581.

The product of its digits is 508032, while the sum is 51.

The square root of 77219898 is about 8787.4853058199. The cubic root of 77219898 is about 425.8366871629.

The spelling of 77219898 in words is "seventy-seven million, two hundred nineteen thousand, eight hundred ninety-eight".