77948289 has 6 divisors (see below), whose sum is σ = 112591986. Its totient is φ = 51965520.

The previous prime is 77948287. The next prime is 77948309. The reversal of 77948289 is 98284977.

It can be written as a sum of positive squares in only one way, i.e., 40640625 + 37307664 = 6375^2 + 6108^2 .

It is not a de Polignac number, because 77948289 - 2¹ = 77948287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77948287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4330452 + ... + 4330469.

It is an arithmetic number, because the mean of its divisors is an integer number (18765331).

Almost surely, 2^77948289 is an apocalyptic number.

It is an amenable number.

77948289 is a deficient number, since it is larger than the sum of its proper divisors (34643697).

77948289 is a wasteful number, since it uses less digits than its factorization.

77948289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8660927 (or 8660924 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 77948289 is about 8828.8328220666. The cubic root of 77948289 is about 427.1714270173.

The spelling of 77948289 in words is "seventy-seven million, nine hundred forty-eight thousand, two hundred eighty-nine".