77111028 has 30 divisors (see below), whose sum is σ = 201584306. Its totient is φ = 25703568.

The previous prime is 77111011. The next prime is 77111039. The reversal of 77111028 is 82011177.

It can be written as a sum of positive squares in only one way, i.e., 65901924 + 11209104 = 8118^2 + 3348^2 .

It is a super-2 number, since 2×77111028² = 11892221278433568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 77110992 and 77111010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 118675 + ... + 119322.

Almost surely, 2^77111028 is an apocalyptic number.

It is an amenable number.

77111028 is an abundant number, since it is smaller than the sum of its proper divisors (124473278).

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

77111028 is a wasteful number, since it uses less digits than its factorization.

77111028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238013 (or 238002 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 77111028 is about 8781.2885159298. The cubic root of 77111028 is about 425.6364682815.

The spelling of 77111028 in words is "seventy-seven million, one hundred eleven thousand, twenty-eight".