77028990218 has 4 divisors (see below), whose sum is σ = 115543485330. Its totient is φ = 38514495108.

The previous prime is 77028990193. The next prime is 77028990271. The reversal of 77028990218 is 81209982077.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 70621468009 + 6407522209 = 265747^2 + 80047^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77028990218.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19257247553 + ... + 19257247556.

Almost surely, 2^77028990218 is an apocalyptic number.

77028990218 is a deficient number, since it is larger than the sum of its proper divisors (38514495112).

77028990218 is a wasteful number, since it uses less digits than its factorization.

77028990218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38514495111.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The spelling of 77028990218 in words is "seventy-seven billion, twenty-eight million, nine hundred ninety thousand, two hundred eighteen".