77725147 has 4 divisors (see below), whose sum is σ = 77751576. Its totient is φ = 77698720.

The previous prime is 77725097. The next prime is 77725157. The reversal of 77725147 is 74152777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74152777 = 53 ⋅1399109.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77725147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77725157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8158 + ... + 14899.

It is an arithmetic number, because the mean of its divisors is an integer number (19437894).

Almost surely, 2^77725147 is an apocalyptic number.

77725147 is a deficient number, since it is larger than the sum of its proper divisors (26429).

77725147 is a wasteful number, since it uses less digits than its factorization.

77725147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26428.

The product of its digits is 96040, while the sum is 40.

The square root of 77725147 is about 8816.1866472983. The cubic root of 77725147 is about 426.7634172547.

The spelling of 77725147 in words is "seventy-seven million, seven hundred twenty-five thousand, one hundred forty-seven".