77742723 has 4 divisors (see below), whose sum is σ = 103656968. Its totient is φ = 51828480.

The previous prime is 77742689. The next prime is 77742727. The reversal of 77742723 is 32724777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32724777 = 3 ⋅10908259.

It is not a de Polignac number, because 77742723 - 2⁶ = 77742659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77742727) 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, 12957118 + ... + 12957123.

It is an arithmetic number, because the mean of its divisors is an integer number (25914242).

Almost surely, 2^77742723 is an apocalyptic number.

77742723 is a deficient number, since it is larger than the sum of its proper divisors (25914245).

77742723 is a wasteful number, since it uses less digits than its factorization.

77742723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25914244.

The product of its digits is 115248, while the sum is 39.

The square root of 77742723 is about 8817.1833938055. The cubic root of 77742723 is about 426.7955828570.

The spelling of 77742723 in words is "seventy-seven million, seven hundred forty-two thousand, seven hundred twenty-three".