77742945 has 24 divisors (see below), whose sum is σ = 154005696. Its totient is φ = 35539488.

The previous prime is 77742937. The next prime is 77742961. The reversal of 77742945 is 54924777.

It is not a de Polignac number, because 77742945 - 2³ = 77742937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 77742945.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123087 + ... + 123716.

It is an arithmetic number, because the mean of its divisors is an integer number (6416904).

Almost surely, 2^77742945 is an apocalyptic number.

It is an amenable number.

77742945 is a deficient number, since it is larger than the sum of its proper divisors (76262751).

77742945 is a wasteful number, since it uses less digits than its factorization.

77742945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246821 (or 246818 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 77742945 is about 8817.1959828508. The cubic root of 77742945 is about 426.7959891052.

It can be divided in two parts, 77742 and 945, that added together give a palindrome (78687).

The spelling of 77742945 in words is "seventy-seven million, seven hundred forty-two thousand, nine hundred forty-five".