77941945 has 4 divisors (see below), whose sum is σ = 93530340. Its totient is φ = 62353552.

The previous prime is 77941931. The next prime is 77941949. The reversal of 77941945 is 54914977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54914977 = 13 ⋅4224229.

It can be written as a sum of positive squares in 2 ways, for example, as 8503056 + 69438889 = 2916^2 + 8333^2 .

It is a cyclic number.

It is not a de Polignac number, because 77941945 - 2¹³ = 77933753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77941895 and 77941904.

It is not an unprimeable number, because it can be changed into a prime (77941949) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7794190 + ... + 7794199.

It is an arithmetic number, because the mean of its divisors is an integer number (23382585).

Almost surely, 2^77941945 is an apocalyptic number.

It is an amenable number.

77941945 is a deficient number, since it is larger than the sum of its proper divisors (15588395).

77941945 is a wasteful number, since it uses less digits than its factorization.

77941945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15588394.

The product of its digits is 317520, while the sum is 46.

The square root of 77941945 is about 8828.4735373676. The cubic root of 77941945 is about 427.1598379280.

It can be divided in two parts, 779 and 41945, that added together give a palindrome (42724).

The spelling of 77941945 in words is "seventy-seven million, nine hundred forty-one thousand, nine hundred forty-five".