77954409 has 12 divisors (see below), whose sum is σ = 121262596. Its totient is φ = 47971872.

The previous prime is 77954377. The next prime is 77954423. The reversal of 77954409 is 90445977.

It can be written as a sum of positive squares in 2 ways, for example, as 41990400 + 35964009 = 6480^2 + 5997^2 .

It is not a de Polignac number, because 77954409 - 2⁵ = 77954377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77954479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 333022 + ... + 333255.

Almost surely, 2^77954409 is an apocalyptic number.

It is an amenable number.

77954409 is a deficient number, since it is larger than the sum of its proper divisors (43308187).

77954409 is a wasteful number, since it uses less digits than its factorization.

77954409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666296 (or 666293 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 77954409 is about 8829.1794069438. The cubic root of 77954409 is about 427.1826063122.

The spelling of 77954409 in words is "seventy-seven million, nine hundred fifty-four thousand, four hundred nine".