77742147 has 8 divisors (see below), whose sum is σ = 118464256. Its totient is φ = 44424072.

The previous prime is 77742131. The next prime is 77742163. The reversal of 77742147 is 74124777.

It is an interprime number because it is at equal distance from previous prime (77742131) and next prime (77742163).

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

It is not a de Polignac number, because 77742147 - 2⁴ = 77742131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77742107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1850983 + ... + 1851024.

It is an arithmetic number, because the mean of its divisors is an integer number (14808032).

Almost surely, 2^77742147 is an apocalyptic number.

77742147 is a deficient number, since it is larger than the sum of its proper divisors (40722109).

77742147 is a wasteful number, since it uses less digits than its factorization.

77742147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702017.

The product of its digits is 76832, while the sum is 39.

The square root of 77742147 is about 8817.1507302529. The cubic root of 77742147 is about 426.7945288040.

It can be divided in two parts, 777 and 42147, that added together give a palindrome (42924).

The spelling of 77742147 in words is "seventy-seven million, seven hundred forty-two thousand, one hundred forty-seven".