77828018 has 4 divisors (see below), whose sum is σ = 116742030. Its totient is φ = 38914008.

The previous prime is 77827951. The next prime is 77828027. The reversal of 77828018 is 81082877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81082877 = 17 ⋅4769581.

It can be written as a sum of positive squares in only one way, i.e., 43335889 + 34492129 = 6583^2 + 5873^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19457003 + ... + 19457006.

Almost surely, 2^77828018 is an apocalyptic number.

77828018 is a deficient number, since it is larger than the sum of its proper divisors (38914012).

77828018 is a wasteful number, since it uses less digits than its factorization.

77828018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38914011.

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 77828018 is about 8822.0189299275. The cubic root of 77828018 is about 426.9516112827.

The spelling of 77828018 in words is "seventy-seven million, eight hundred twenty-eight thousand, eighteen".