77081845 has 8 divisors (see below), whose sum is σ = 94754520. Its totient is φ = 60161280.

The previous prime is 77081831. The next prime is 77081897. The reversal of 77081845 is 54818077.

It can be written as a sum of positive squares in 4 ways, for example, as 3104644 + 73977201 = 1762^2 + 8601^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77081845 - 2⁵ = 77081813 is a prime.

It is a super-2 number, since 2×77081845² = 11883221657208050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77081798 and 77081807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187800 + ... + 188209.

It is an arithmetic number, because the mean of its divisors is an integer number (11844315).

Almost surely, 2^77081845 is an apocalyptic number.

It is an amenable number.

77081845 is a deficient number, since it is larger than the sum of its proper divisors (17672675).

77081845 is a wasteful number, since it uses less digits than its factorization.

77081845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376055.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 77081845 is about 8779.6267004925. The cubic root of 77081845 is about 425.5827668561.

The spelling of 77081845 in words is "seventy-seven million, eighty-one thousand, eight hundred forty-five".