77897434 has 16 divisors (see below), whose sum is σ = 124516008. Its totient is φ = 36421632.

The previous prime is 77897431. The next prime is 77897441. The reversal of 77897434 is 43479877.

It can be written as a sum of positive squares in 4 ways, for example, as 53246209 + 24651225 = 7297^2 + 4965^2 .

It is not an unprimeable number, because it can be changed into a prime (77897431) 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, 1959 + ... + 12634.

Almost surely, 2^77897434 is an apocalyptic number.

77897434 is a deficient number, since it is larger than the sum of its proper divisors (46618574).

77897434 is a wasteful number, since it uses less digits than its factorization.

77897434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14769.

The product of its digits is 1185408, while the sum is 49.

The square root of 77897434 is about 8825.9522998938. The cubic root of 77897434 is about 427.0785084544.

The spelling of 77897434 in words is "seventy-seven million, eight hundred ninety-seven thousand, four hundred thirty-four".