77145893 has 4 divisors (see below), whose sum is σ = 84159168. Its totient is φ = 70132620.

The previous prime is 77145883. The next prime is 77145917. The reversal of 77145893 is 39854177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39854177 = 11 ⋅3623107.

It is a cyclic number.

It is not a de Polignac number, because 77145893 - 2⁸ = 77145637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77145853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3506621 + ... + 3506642.

It is an arithmetic number, because the mean of its divisors is an integer number (21039792).

Almost surely, 2^77145893 is an apocalyptic number.

It is an amenable number.

77145893 is a deficient number, since it is larger than the sum of its proper divisors (7013275).

77145893 is a wasteful number, since it uses less digits than its factorization.

77145893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013274.

The product of its digits is 211680, while the sum is 44.

The square root of 77145893 is about 8783.2734786069. The cubic root of 77145893 is about 425.7006077431.

It can be divided in two parts, 771 and 45893, that added together give a palindrome (46664).

The spelling of 77145893 in words is "seventy-seven million, one hundred forty-five thousand, eight hundred ninety-three".