77908049 has 8 divisors (see below), whose sum is σ = 78489000. Its totient is φ = 77329792.

The previous prime is 77908021. The next prime is 77908057. The reversal of 77908049 is 94080977.

It can be written as a sum of positive squares in 4 ways, for example, as 1030225 + 76877824 = 1015^2 + 8768^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 77908049 - 2⁸ = 77907793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77908099) 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, 136637 + ... + 137205.

It is an arithmetic number, because the mean of its divisors is an integer number (9811125).

Almost surely, 2^77908049 is an apocalyptic number.

It is an amenable number.

77908049 is a deficient number, since it is larger than the sum of its proper divisors (580951).

77908049 is a wasteful number, since it uses less digits than its factorization.

77908049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 77908049 is about 8826.5536309479. The cubic root of 77908049 is about 427.0979067505.

The spelling of 77908049 in words is "seventy-seven million, nine hundred eight thousand, forty-nine".